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  • 51.
    AGALOMBA, CHRISTINE AFANDI
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Factors contributing to failure of egovernment projects in developing countries: a literature review2012Självständigt arbete på avancerad nivå (masterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
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  • 52.
    Agarwal, N.
    et al.
    64-C, Mittal Towers, Nariman Point, Mumbai, India.
    Chan, J.M.L.
    Department of Economics and Business Economics, Aarhus University, Aarhus, Denmark.
    Lodefalk, Magnus
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Global Labor Organization, Essen, Germany; Ratio, Stockholm, Sweden.
    Tang, Aili
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Department of Economics.
    Tano, S.
    Swedish Agency for Growth Policy Analysis, Stockholm, Sweden.
    Wang, Z.
    Faculty of Business and Law, De Montfort University, The Gateway, Leicester, United Kingdom; GEP, University of Nottingham, Nottingham, United Kingdom.
    Mitigating information frictions in trade: Evidence from export credit guarantees2023Ingår i: Journal of International Economics, ISSN 0022-1996, E-ISSN 1873-0353, Vol. 145, artikel-id 103831Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Information frictions make foreign trade risky. In particular, the risk of buyer default deters firms from selling abroad. To address this issue, many countries offer export credit guarantees to provide insurance to exporters. In this paper, we investigate the causal effects of guarantees by exploiting a quasi-natural experiment in Sweden and rich register data on guarantees, firms and trade. Estimates from a fuzzy regression discontinuity design show large positive effects on the probability of exporting and the value of exports to the destination for which the guarantees are issued. These results are robust to an alternative approach using a difference-in-differences matching estimator. Further findings suggest that guarantees impact firms heterogeneously and play an important role in resolving buyer default risk and easing liquidity constraints. Larger impacts are observed in non-OECD countries, on smaller, liquidity constrained exporters and for firms selling products that face a relatively high cost of buyer default.

  • 53. Agarwal, Natasha
    et al.
    Lodefalk, Magnus
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Ratio Institute, Sweden.
    Stenberg, Majken
    Ratio Institute, Sweden.
    Tang, Aili
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Ratio Institute, Sweden.
    Tano, Sofia
    Swedish Agency for Growth Policy Analysis, Sweden.
    Wang, Zheng
    De Montfort University, Leicester, UK.
    The effects of export credit guarantees on firm performance2019Övrigt (Övrigt vetenskapligt)
  • 54. Agarwal, Natasha
    et al.
    Lodefalk, Magnus
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Ratio, Stockholm, Sweden; Global Labor Organization.
    Tang, Aili
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Tano, Sofia
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Growth Analysis, Östersund, Sweden.
    Wang, Zheng
    De Montfort University, Leicester, UK.
    Guaranteed Success?: The Effects of Export Credit Guarantees on Firm Performance2019Konferensbidrag (Refereegranskat)
    Abstract [en]

    Many countries offer government-backed export credit guarantees to domestic firms. We investigate the effects of such guarantees on firm exports, jobs and value added. Using uniquely detailed and exhaustive transaction-level panel data on guarantees and granular information on trade, exporters and foreign buyers, we perform difference-indifferences matching estimations. We find that guarantees improve firm performance. However, the effects are strikingly heterogeneous across firm size and response variables. Using guarantees increases the firm-destination probability of exporting and the value of exports by 18 and 172 percent, respectively, but does not generally increase jobs or value added. Smaller firms benefit the most in terms of exports. Overall, the evidence suggests a causal link from guarantees to firm export performance.

  • 55.
    Agarwal, Natasha
    et al.
    Research and Outcome, Mumbai, India.
    Lodefalk, Magnus
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Ratio Institute, Stockholm, Sweden.
    Tang, Aili
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Ratio Institute, Stockholm, Sweden.
    Tano, Sofia
    Wang, Zheng
    De Montfort University, Leicester, UK.
    Institutions for Non-Simultaneous Exchange: Microeconomic Evidence from Export Insurance2018Rapport (Övrigt vetenskapligt)
    Abstract [en]

    Information frictions make non-simultaneous exchange risky, particularly across borders. Therefore, many countries insure cross-border exchange. We investigate the effects on firm trade, jobs, value added and productivity, using uniquely detailed, comprehensive and longitudinal transaction-level Swedish data on insurance and granular data on exporters and foreign buyers. For identification, we employ matching and differencein-difference and fuzzy regression discontinuity estimators and exploit a quasi-natural experiment. We find strikingly heterogeneous effects across firm size and response variables. The strongest positive effects are for small traders and new users. Overall, the evidence suggests a causal link from export insurance to firm performance.

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    Institutions for Non-Simultaneous Exchange: Microeconomic Evidence from Export Insurance
  • 56.
    Age, Oskar
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Carlsson, Anna
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Larsson-Torri, Emma
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Vad motiverar redovisningsval?: En litteraturgenomgång från millenniumskiftet fram till idag2018Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
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  • 57.
    Agebro, Jessica
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Bergetoft, Fanny
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Sponsring av individuella elitidrottare ur ett företagsperspektiv2018Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
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  • 58.
    Agerhall Ekholm, Matilda
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Haaster, Mia
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Larsson, Helena
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Intern kommunikation vid tvingat distansarbete En kvalitativ fallstudie som undersöker hur tvingat distansarbete ur ett senare skede av corona-pandemin påverkat den interna kommunikationen, och därmed den tillhörighet medarbetare upplever gentemot organisationen.2022Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
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  • 59.
    Agewall, Cecilia
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Sommarström, Julina
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Legitimitet som en nyckel till acceptans: En studie om legitimitetsskapande2014Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
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  • 60.
    Aghanavesi, Somayeh
    et al.
    Department of Computer Engineering, Dalarna University, Borlänge, Sweden.
    Bergquist, Filip
    Department of Pharmacology, Institute of Neuroscience and Physiology, Gothenburg University, Gothenburg, Sweden.
    Nyholm, Dag
    Department of Neuroscience, Neurology, Uppsala University, Uppsala, Sweden.
    Senek, Marina
    Department of Neuroscience, Neurology, Uppsala University, Uppsala, Sweden.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Motion sensor-based assessment of Parkinson's disease motor symptoms during leg agility tests: results from levodopa challenge2020Ingår i: IEEE journal of biomedical and health informatics, ISSN 2168-2194, E-ISSN 2168-2208, Vol. 24, nr 1, s. 111-118Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Parkinson's disease (PD) is a degenerative, progressive disorder of the central nervous system that mainly affects motor control. The aim of this study was to develop data-driven methods and test their clinimetric properties to detect and quantify PD motor states using motion sensor data from leg agility tests. Nineteen PD patients were recruited in a levodopa single dose challenge study. PD patients performed leg agility tasks while wearing motion sensors on their lower extremities. Clinical evaluation of video recordings was performed by three movement disorder specialists who used four items from the motor section of the Unified PD Rating Scale (UPDRS), the treatment response scale (TRS) and a dyskinesia score. Using the sensor data, spatiotemporal features were calculated and relevant features were selected by feature selection. Machine learning methods like support vector machines (SVM), decision trees and linear regression, using 10-fold cross validation were trained to predict motor states of the patients. SVM showed the best convergence validity with correlation coefficients of 0.81 to TRS, 0.83 to UPDRS #31 (body bradykinesia and hypokinesia), 0.78 to SUMUPDRS (the sum of the UPDRS items: #26-leg agility, #27-arising from chair and #29-gait), and 0.67 to dyskinesia. Additionally, the SVM-based scores had similar test-retest reliability in relation to clinical ratings. The SVM-based scores were less responsive to treatment effects than the clinical scores, particularly with regards to dyskinesia. In conclusion, the results from this study indicate that using motion sensors during leg agility tests may lead to valid and reliable objective measures of PD motor symptoms.

  • 61.
    Aghanavesi, Somayeh
    et al.
    Computer Engineering, School of Technology and Business Studies, Borlänge, Dalarna University, Sweden.
    Bergquist, Filip
    Dept. of Pharmacology, University of Gothenburg, Gothenburg, Sweden.
    Nyholm, Dag
    Dept. of Neuroscience, Neurology, Uppsala University, Uppsala, Sweden.
    Senek, Marina
    Dept. of Neuroscience, Neurology, Uppsala University, Uppsala, Sweden.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Objective assessment of Parkinson’s disease motor symptoms during leg agility test using motion sensors2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    Title: Objective assessment of Parkinson’s disease motor symptoms during leg agility test using motion sensors

    Objective: To develop and evaluate machine learning methods for assessment of Parkinson’s disease (PD) motor symptoms using leg agility (LA) data collected with motion sensors during a single dose experiment.

    Background: Nineteen advanced PD patients (Gender: 14 males and 5 females, mean age: 71.4, mean years with PD: 9.7, mean years with levodopa: 9.5) were recruited in a single center, open label, single dose clinical trial in Sweden [1].

    Methods: The patients performed up to 15 LA tasks while wearing motions sensors on their foot ankle. They performed tests at pre-defined time points starting from baseline, at the time they received a morning dose (150% of their levodopa equivalent morning dose), and at follow-up time points until the medication wore off. The patients were video recorded while performing the motor tasks. and three movement disorder experts rated the observed motor symptoms using 4 items from the Unified PD Rating Scale (UPDRS) motor section including UPDRS #26 (leg agility), UPDRS #27 (Arising from chair), UPDRS #29 (Gait), UPDRS #31 (Body Bradykinesia and Hypokinesia), and dyskinesia scale. In addition, they rated the overall mobility of the patients using Treatment Response Scale (TRS), ranging from -3 (very off) to 3 (very dyskinetic). Sensors data were processed and their quantitative measures were used to develop machine learning methods, which mapped them to the mean ratings of the three raters. The quality of measurements of the machine learning methods was assessed by convergence validity, test-retest reliability and sensitivity to treatment.

    Results: Results from the 10-fold cross validation showed good convergent validity of the machine learning methods (Support Vector Machines, SVM) with correlation coefficients of 0.81 for TRS, 0.78 for UPDRS #26, 0.69 for UPDRS #27, 0.78 for UPDRS #29, 0.83 for UPDRS #31, and 0.67 for dyskinesia scale (P<0.001). There were good correlations between scores produced by the methods during the first (baseline) and second tests with coefficients ranging from 0.58 to 0.96, indicating good test-retest reliability. The machine learning methods had lower sensitivity than mean clinical ratings (Figure. 1).

    Conclusions: The presented methodology was able to assess motor symptoms in PD well, comparable to movement disorder experts. The leg agility test did not reflect treatment related changes.

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    Objective assessment of Parkinson’s disease motor symptoms during leg agility test using motion sensors
  • 62.
    Aghanavesi, Somayeh
    et al.
    Computer Engineering, School of Technology and Business Studies, Dalarna University, Borlänge, Sweden.
    Filip, Bergquist
    Dept. of Pharmacology, University of Gothenburg, Gothenbrug, Sweden.
    Nyholm, Dag
    Dept. of Neuroscience, Neurology, Uppsala University, Uppsala, Sweden.
    Senek, Marina
    Dept. of Neuroscience, Neurology, Uppsala University, Uppsala, Sweden.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Feasibility of a multi-sensor data fusion method for assessment of Parkinson’s disease motor symptoms2018Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Title: Feasibility of a multi-sensor data fusion method for assessment of Parkinson’s disease motor symptoms

    Objective: To assess the feasibility of measuring Parkinson’s disease (PD) motor symptoms with a multi-sensor data fusion method. More specifically, the aim is to assess validity, reliability and sensitivity to treatment of the methods.

    Background: Data from 19 advanced PD patients (Gender: 14 males and 5 females, mean age: 71.4, mean years with PD: 9.7, mean years with levodopa: 9.5) were collected in a single center, open label, single dose clinical trial in Sweden [1].

    Methods: The patients performed leg agility and 2-5 meter straight walking tests while wearing motion sensors on their limbs. They performed the tests at baseline, at the time they received the morning dose, and at pre-specified time points until the medication wore off. While performing the tests the patients were video recorded. The videos were observed by three movement disorder specialists who rated the symptoms using a treatment response scale (TRS), ranging from -3 (very off) to 3 (very dyskinetic). The sensor data consisted of lower limb data during leg agility, upper limb data during walking, and lower limb data during walking. Time series analysis was performed on the raw sensor data extracted from 17 patients to derive a set of quantitative measures, which were then used during machine learning to be mapped to mean ratings of the three raters on the TRS scale. Combinations of data were tested during the machine learning procedure.

    Results: Using data from both tests, the Support Vector Machines (SVM) could predict the motor states of the patients on the TRS scale with a good agreement in relation to the mean ratings of the three raters (correlation coefficient = 0.92, root mean square error = 0.42, p<0.001). Additionally, there was good test-retest reliability of the SVM scores during baseline and second tests with intraclass-correlation coefficient of 0.84. Sensitivity to treatment for SVM was good (Figure 1), indicating its ability to detect changes in motor symptoms. The upper limb data during walking was more informative than lower limb data during walking since SVMs had higher correlation coefficient to mean ratings.  

    Conclusions: The methodology demonstrates good validity, reliability, and sensitivity to treatment. This indicates that it could be useful for individualized optimization of treatments among PD patients, leading to an improvement in health-related quality of life.

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    Feasibility of a multi-sensor data fusion method for assessment of Parkinson’s disease motor symptoms
  • 63.
    Aghanavesi, Somayeh
    et al.
    School of Technology and Business Studies, Computer Engineering, Dalarna University, Falun, Sweden.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Dougherty, Mark
    School of Technology and Business Studies, Computer Engineering, Dalarna University, Falun, Sweden.
    Nyholm, Dag
    Department of Neuroscience, Neurology, Uppsala University, Uppsala, Sweden.
    Westin, Jerker
    School of Technology and Business Studies, Computer Engineering, Dalarna University, Falun, Sweden.
    Verification of a Method for Measuring Parkinson’s Disease Related Temporal Irregularity in Spiral Drawings2017Ingår i: Sensors, E-ISSN 1424-8220, Vol. 17, nr 10, artikel-id 2341Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Parkinson’s disease (PD) is a progressive movement disorder caused by the death of dopamine-producing cells in the midbrain. There is a need for frequent symptom assessment, since the treatment needs to be individualized as the disease progresses. The aim of this paper was to verify and further investigate the clinimetric properties of an entropy-based method for measuring PD-related upper limb temporal irregularities during spiral drawing tasks. More specifically, properties of a temporal irregularity score (TIS) for patients at different stages of PD, and medication time points were investigated. Nineteen PD patients and 22 healthy controls performed repeated spiral drawing tasks on a smartphone. Patients performed the tests before a single levodopa dose and at specific time intervals after the dose was given. Three movement disorder specialists rated videos of the patients based on the unified PD rating scale (UPDRS) and the Dyskinesia scale. Differences in mean TIS between the groups of patients and healthy subjects were assessed. Test-retest reliability of the TIS was measured. The ability of TIS to detect changes from baseline (before medication) to later time points was investigated. Correlations between TIS and clinical rating scores were assessed. The mean TIS was significantly different between healthy subjects and patients in advanced groups (p-value = 0.02). Test-retest reliability of TIS was good with Intra-class Correlation Coefficient of 0.81. When assessing changes in relation to treatment, TIS contained some information to capture changes from Off to On and wearing off effects. However, the correlations between TIS and clinical scores (UPDRS and Dyskinesia) were weak. TIS was able to differentiate spiral drawings drawn by patients in an advanced stage from those drawn by healthy subjects, and TIS had good test-retest reliability. TIS was somewhat responsive to single-dose levodopa treatment. Since TIS is an upper limb high-frequency-based measure, it cannot be detected during clinical assessment.

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  • 64.
    Aghanavesi, Somayeh
    et al.
    Computer Engineering, School of Technology and Business Studies, Dalarna University, Borlänge, Sweden.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Westin, Jerker
    Computer Engineering, School of Technology and Business Studies, Dalarna University, Borlänge, Sweden.
    Measuring temporal irregularity in spiral drawings of patients with Parkinson’s disease2017Ingår i: Abstracts of the 21st International Congress of Parkinson's Disease and Movement Disorders, John Wiley & Sons, 2017, Vol. 32, s. s252-s252, artikel-id 654Konferensbidrag (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    Objective: The aim of this work is to evaluate clinimetric properties of a method for measuring Parkinson’s disease (PD) upper limb temporal irregularities during spiral drawing tasks.

    Background: Basal ganglia fluctuations of PD patients are associated with motor symptoms and relating them to objective sensor-based measures may facilitate the assessment of temporal irregularities, which could be difficult to be assessed visually. The present study investigated the upper limb temporal irregularity of patients at different stages of PD and medication time points.

    Methods: Nineteen PD patients and 22 healthy controls performed repeated spiral drawing tasks on a smartphone. Patients performed the tests before a single levodopa dose and at specific time intervals after the dose was given. Three movement disorder specialists rated the videos of patients' performance according to six items of UPDRS-III, dyskinesia (Dys), and Treatment Response Scale (TRS). A temporal irregularity score (TIS) was developed using approximate entropy (ApEn) method. Differences in mean TIS between two groups of patients and healthy subjects, and also across four subject groups: early, intermediate, advanced patients and, healthy subjects were assessed. The relative ability of TIS to detect changes from baseline (no medication) to later time points when patients were on medication was assessed. Correlations between TIS and clinical rating scales were assessed by Pearson correlation coefficients and test-retest reliability of TIS was measured by intra-class correlation coefficients (ICC).

    Results: The mean TIS was significantly different between healthy subjects and patients (P<0.0001). When assessing the changes in relation to treatment, clinical-based scores (TRS and Dys) had better responsiveness than TIS. However, the TIS was able to capture changes from Off to On, and the wearing off effects. Correlations between TIS and clinical scales were low indicating poor validity. Test-retest reliability correlation coefficient of the mean TIS was good (ICC=0.67).

    Conclusions: Our study found that TIS was able to differentiate spiral drawings drawn by patients from those drawn by healthy subjects. In addition, TIS could capture changes throughout the levodopa cycle.TIS was weakly correlated to clinical ratings indicating that TIS measures high frequency upper limb temporal irregularities that could be difficult to be detected during clinical observations.

  • 65.
    Aghanavesi, Somayeh
    et al.
    Computer Engineering, School of Technology and Business Studies, Dalarna University, Falun, Sweden.
    Nyholm, Dag
    Dept. of Neuroscience, Neurology, Uppsala University, Uppsala, Sweden.
    Senek, Marina
    Dept. of Neuroscience, Neurology, Uppsala University, Uppsala, Sweden.
    Bergquist, Filip
    Dept. of Pharmacology, University of Gothenburg, Gothenburg, Sweden.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Computer Engineering, School of Technology and Business Studies, Dalarna University, Falun, Sweden.
    A smartphone-based system to quantify dexterity in Parkinson's disease patients2017Ingår i: Informatics in Medicine Unlocked, ISSN 2352-9148, Vol. 9, s. 11-17Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Objectives

    The aim of this paper is to investigate whether a smartphone-based system can be used to quantify dexterity in Parkinson's disease (PD). More specifically, the aim was to develop data-driven methods to quantify and characterize dexterity in PD.

    Methods

    Nineteen advanced PD patients and 22 healthy controls participated in a clinical trial in Uppsala, Sweden. The subjects were asked to perform tapping and spiral drawing tests using a smartphone. Patients performed the tests before, and at pre-specified time points after they received 150% of their usual levodopa morning dose. Patients were video recorded and their motor symptoms were assessed by three movement disorder specialists using three Unified PD Rating Scale (UPDRS) motor items from part III, the dyskinesia scoring and the treatment response scale (TRS). The raw tapping and spiral data were processed and analyzed with time series analysis techniques to extract 37 spatiotemporal features. For each of the five scales, separate machine learning models were built and tested by using principal components of the features as predictors and mean ratings of the three specialists as target variables.

    Results

    There were weak to moderate correlations between smartphone-based scores and mean ratings of UPDRS item #23 (0.52; finger tapping), UPDRS #25 (0.47; rapid alternating movements of hands), UPDRS #31 (0.57; body bradykinesia and hypokinesia), sum of the three UPDRS items (0.46), dyskinesia (0.64), and TRS (0.59). When assessing the test-retest reliability of the scores it was found that, in general, the clinical scores had better test-retest reliability than the smartphone-based scores. Only the smartphone-based predicted scores on the TRS and dyskinesia scales had good repeatability with intra-class correlation coefficients of 0.51 and 0.84, respectively. Clinician-based scores had higher effect sizes than smartphone-based scores indicating a better responsiveness in detecting changes in relation to treatment interventions. However, the first principal component of the 37 features was able to capture changes throughout the levodopa cycle and had trends similar to the clinical TRS and dyskinesia scales. Smartphone-based scores differed significantly between patients and healthy controls.

    Conclusions

    Quantifying PD motor symptoms via instrumented, dexterity tests employed in a smartphone is feasible and data from such tests can also be used for measuring treatment-related changes in patients.

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  • 66.
    Aghanavesi, Somayeh
    et al.
    Department of Computer Engineering, Dalarna University, Falun, Sweden.
    Westin, Jerker
    Department of Computer Engineering, Dalarna University, Falun, Sweden.
    Bergquist, Filip
    Department of Pharmacology at Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden.
    Nyholm, Dag
    Department of Neuroscience, Neurology at Uppsala University, Uppsala, Sweden.
    Askmark, Håkan
    Department of Neuroscience, Neurology at Uppsala University, Uppsala, Sweden.
    Aquilonius, Sten Magnus
    Department of Neuroscience, Neurology at Uppsala University, Uppsala, Sweden.
    Constantinescu, Radu
    Department of Clinical Neuroscience, University of Gothenburg, Gothenburg, Sweden.
    Medvedev, Alexander
    Department of Information Technology, at Uppsala University, Uppsala, Sweden.
    Spira, Jack
    Sensidose AB, Sollentuna, Sweden.
    Ohlsson, Fredrik
    Department of Sensor Systems at Acreo Swedish ICT, Kista, Sweden.
    Thomas, Ilias
    Department of Statistics, Dalarna University, Falun, Sweden.
    Ericsson, Anders
    Department of Clinical Neuroscience and Rehabilitation, University of Gothenburg, Gothenburg, Sweden.
    Johansson Buvarp, Dongni
    Irisity AB, Gothenburg.
    Memedi, Mevludin
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    A multiple motion sensors index for motor state quantification in Parkinson's disease2020Ingår i: Computer Methods and Programs in Biomedicine, ISSN 0169-2607, E-ISSN 1872-7565, Vol. 189, artikel-id 105309Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Aim: To construct a Treatment Response Index from Multiple Sensors (TRIMS) for quantification of motor state in patients with Parkinson's disease (PD) during a single levodopa dose. Another aim was to compare TRIMS to sensor indexes derived from individual motor tasks.

    Method: Nineteen PD patients performed three motor tests including leg agility, pronation-supination movement of hands, and walking in a clinic while wearing inertial measurement unit sensors on their wrists and ankles. They performed the tests repeatedly before and after taking 150% of their individual oral levodopa-carbidopa equivalent morning dose.Three neurologists blinded to treatment status, viewed patients’ videos and rated their motor symptoms, dyskinesia, overall motor state based on selected items of Unified PD Rating Scale (UPDRS) part III, Dyskinesia scale, and Treatment Response Scale (TRS). To build TRIMS, out of initially 178 extracted features from upper- and lower-limbs data, 39 features were selected by stepwise regression method and were used as input to support vector machines to be mapped to mean reference TRS scores using 10-fold cross-validation method. Test-retest reliability, responsiveness to medication, and correlation to TRS as well as other UPDRS items were evaluated for TRIMS.

    Results: The correlation of TRIMS with TRS was 0.93. TRIMS had good test-retest reliability (ICC=0.83). Responsiveness of the TRIMS to medication was good compared to TRS indicating its power in capturing the treatment effects. TRIMS was highly correlated to dyskinesia (R = 0.85), bradykinesia (R=0.84) and gait (R=0.79) UPDRS items. Correlation of sensor index from the upper-limb to TRS was 0.89.

    Conclusion: Using the fusion of upper- and lower-limbs sensor data to construct TRIMS provided accurate PD motor states estimation and responsive to treatment. In addition, quantification of upper-limb sensor data during walking test provided strong results.

  • 67.
    Agneson, Henry
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Lundberg, Sara
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Von Bothmer, Henrik
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Hållbarhetsredovisning i svenska företag - En branschspecifik studie2016Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
  • 68.
    Agélii Genlott, Annika
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Designing for Transformational Change in School: Digitalizing the Digitized2020Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Digital technologies have gained a prominent role in education and schools, but research concerning how digital technologies can create better conditions for improved teaching and enhanced learning for students is scarce and inconclusive. Successful use of digital technologies requires a complex combination of interacting factors, including integrating technology and pedagogy as well as organizing and leading a structured transformation process. The capability of school organizations to lead and support the digitalization process is an under-researched field compared to the well-established focus on individual stakeholders.

    This thesis examines how experimentation and innovation processes in school can be designed and pursued to support and enhance digitalization across an entire school organization by using a Design Science Research (DSR) approach to answer the question: How can a school organization at municipal level lead digital transformation through the digitalization of teaching and learning processes in an organized, professional, and, as far as possible, scientifically based way?

    The findings show that the design and use of the Information System Artifact model (ISA) together with a DSR development method can support both improved teaching and enhanced learning within and across a school organization. Effective use of digital technologies to improve teaching and learning across the school organization requires fundamental changes of ordinary practices and engagement as well as commitment from school authorities and school leaders.

    This thesis contributes with empirically and theoretically based insights from leading (digital) transformational change in school through the iterative design of IS artifacts used as a driver and quality control for the shift from digitization towards digitalization aiming at improved teaching and enhanced learning.

    Delarbeten
    1. Improving literacy skills through learning reading by writing: The iWTR method presented and tested
    Öppna denna publikation i ny flik eller fönster >>Improving literacy skills through learning reading by writing: The iWTR method presented and tested
    2013 (Engelska)Ingår i: Computers and education, ISSN 0360-1315, E-ISSN 1873-782X, Vol. 67, s. 98-104Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Learning to read and write is a basic skill that unfortunately not everybody acquires sufficiently. Lack of teachers and time in school are some of the reasons, but in addition the enormous rise in informational activities due to the Internet and other information technology-enabled opportunities has made literacy skills increasingly important to ever more people. This means literacy education must be improved so more children in the world get better chances. In order to contribute to developing better methods for learning to read and write in early years this study tests a new method developed to improve reading and writing learning in early ages. The ICT (Information and communication technologies) supported “Integrated Write to Learn” (iWTR) method lets children in 1st grade use computers and other ICT tools to write texts and subsequently discuss and refine them together with class mates and teachers. Handwriting is postponed to 2nd grade. While the traditional method requires students to go through two development processes in parallel, a cognitive (learning to read and) a motor (learning to write with a pencil), iWTR works with one process at a time, first cognitive development, then (from grade 2) motor skills training. iWTR extends previous WTR methods by more social work methods using a web site and peer comment for providing social meaning and feedback.

    The method was tested using two test groups and two control groups (total n = 87) by systematically measuring performance in reading and writing using standard tests in combination with observations and student evaluation to assess social and individual effects of work methods.

    The results show that while reading skills were improved considerably the biggest improvement concerned writing skills. Students in the test group wrote longer texts with better structure, clearer content, and a more elaborate language.

    Ort, förlag, år, upplaga, sidor
    Elsevier, 2013
    Nyckelord
    Cooperative/collaborative learning, Elementary education, Improving classroom teaching, Teaching/learning strategies
    Nationell ämneskategori
    Systemvetenskap, informationssystem och informatik med samhällsvetenskaplig inriktning Lärande
    Forskningsämne
    Informatik
    Identifikatorer
    urn:nbn:se:oru:diva-29311 (URN)10.1016/j.compedu.2013.03.007 (DOI)000320430500009 ()2-s2.0-84876491142 (Scopus ID)
    Tillgänglig från: 2013-06-03 Skapad: 2013-06-03 Senast uppdaterad: 2020-11-27Bibliografiskt granskad
    2. Closing the gaps: Improving literacy and mathematics by ict-enhanced collaboration
    Öppna denna publikation i ny flik eller fönster >>Closing the gaps: Improving literacy and mathematics by ict-enhanced collaboration
    2016 (Engelska)Ingår i: Computers and education, ISSN 0360-1315, E-ISSN 1873-782X, Vol. 99, s. 68-80Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Literacy and mathematics are necessary skills that for different reasons unfortunately not everybody acquires sufficiently. In OECD countries there is also a gender gap; boys lag behind girls in literacy but often outperform girls in mathematics (OECD, 2012). ICT (Information and communication technologies) may contribute useful tools to address both these problems but in order to effectively create better educational conditions there is yet a need to develop effective methods that combine ICT with key factors for learning. This research contributes to this by measuring effects of the “Write to Learn” (WTL) method. WTL lets children from 1st grade use several ICT tools to write texts and subsequently discuss and refine them together with classmates and teachers using digital real-time formative feedback and assessment. The central learning factor addressed, in mathematics as well as in literacy, is the written communication allowing the learners to interact with peers and teachers. WTL draws on methods from socio-cultural theory, including continuous social interaction and written real-time formative feedback among peers, using shared electronic forums for collaboration, thereby providing social meaning and increased learning of literacy and mathematics, among both boys and girls.

    The study uses quantitative methods and two control groups, one using traditional method (no ICT) and one using technology individually (without integrated social interaction and formative feedback), to compare results from 502 students in grade 3 national tests in mathematics and literacy. WTL yields by far best results; higher average score both in literacy and mathematics, smaller gender gap, and significantly better results for the under-achievers. The ITU method performs worst, which shows that ICT use must be well integrated into the pedagogy to be useful.

    Ort, förlag, år, upplaga, sidor
    Elsevier, 2016
    Nyckelord
    literacy/mathematics; collaborative learning;ICT; formative feedback/assessment; gender gap
    Nationell ämneskategori
    Pedagogik Datavetenskap (datalogi)
    Forskningsämne
    Pedagogik; Datavetenskap
    Identifikatorer
    urn:nbn:se:oru:diva-49861 (URN)10.1016/j.compedu.2016.04.004 (DOI)000376801800006 ()2-s2.0-84964902311 (Scopus ID)
    Anmärkning

    Funding Agency:

    Örebro University

    Tillgänglig från: 2016-04-18 Skapad: 2016-04-18 Senast uppdaterad: 2020-11-16Bibliografiskt granskad
    3. Disseminating digital innovation in school: leading second-order educational change
    Öppna denna publikation i ny flik eller fönster >>Disseminating digital innovation in school: leading second-order educational change
    2019 (Engelska)Ingår i: Education and Information Technologies: Official Journal of the IFIP technical committee on Education, ISSN 1360-2357, E-ISSN 1573-7608, Vol. 24, nr 5, s. 3021-3039Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Using digital technology effectively in schools requires profound changes in traditional teaching and learning activities. Pedagogical innovations often start small-scale and developing good ideas into shared practice across schools is challenging in many ways, especially if the innovation requires second-order change, i.e. challenges to fundamental beliefs about teaching and learning. This study investigates how a validated pedagogical method requiring integrated Information and Communication Technology (ICT) use and second-order change can be disseminated and sustained over time. We surveyed 92 primary school teachers who at different times over a 5-year period participated in a training course designed to implement an innovative technology-supported teaching method, Write To Learn, across an entire city. We found that organized teacher development programs can drive second-order change, but this requires considerable, active, and sustained effort from leaders at both school and district level. Additional factors include immediate and extended social systems and handling diversity among teachers. The results are useful for both practitioners and researchers since they contribute to a deeper understanding of the opportunities and challenges involved in disseminating effective ICT-based methods that requires profound changes of thinking about teaching and learning to guide the transformation of teaching practice.

    Ort, förlag, år, upplaga, sidor
    Springer, 2019
    Nyckelord
    Digitalization, Educational change, Second-order-change, School, Teacher training, Diffusion of innovation
    Nationell ämneskategori
    Utbildningsvetenskap
    Identifikatorer
    urn:nbn:se:oru:diva-76440 (URN)10.1007/s10639-019-09908-0 (DOI)000482394200020 ()2-s2.0-85064651327 (Scopus ID)
    Anmärkning

    Funding Agency:

    Örebro University

    Tillgänglig från: 2019-09-16 Skapad: 2019-09-16 Senast uppdaterad: 2020-11-27Bibliografiskt granskad
    4. Disseminating digital, science-based innovation in education: a leadership challenge
    Öppna denna publikation i ny flik eller fönster >>Disseminating digital, science-based innovation in education: a leadership challenge
    (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
    Nationell ämneskategori
    Systemvetenskap, informationssystem och informatik med samhällsvetenskaplig inriktning
    Identifikatorer
    urn:nbn:se:oru:diva-87392 (URN)
    Tillgänglig från: 2020-11-16 Skapad: 2020-11-16 Senast uppdaterad: 2021-11-01Bibliografiskt granskad
    Ladda ner fulltext (pdf)
    Designing for Transformational Change in School: Digitalizing the Digitized
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    Ladda ner (pdf)
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    Ladda ner (pdf)
    Spikblad
  • 69.
    Agélii Genlott, Annika
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Grönlund, Åke
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Att lära sig läsa och skriva - i nutid och för framtid2014Ingår i: Interaktiva medier och lärandemiljöer / [ed] Elza Dunkels; Simon Lindgren, Malmö: Gleerups Utbildning AB, 2014, 1, s. 155-166Kapitel i bok, del av antologi (Refereegranskat)
  • 70.
    Agélii Genlott, Annika
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Grönlund, Åke
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Closing the gaps: Improving literacy and mathematics by ict-enhanced collaboration2016Ingår i: Computers and education, ISSN 0360-1315, E-ISSN 1873-782X, Vol. 99, s. 68-80Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Literacy and mathematics are necessary skills that for different reasons unfortunately not everybody acquires sufficiently. In OECD countries there is also a gender gap; boys lag behind girls in literacy but often outperform girls in mathematics (OECD, 2012). ICT (Information and communication technologies) may contribute useful tools to address both these problems but in order to effectively create better educational conditions there is yet a need to develop effective methods that combine ICT with key factors for learning. This research contributes to this by measuring effects of the “Write to Learn” (WTL) method. WTL lets children from 1st grade use several ICT tools to write texts and subsequently discuss and refine them together with classmates and teachers using digital real-time formative feedback and assessment. The central learning factor addressed, in mathematics as well as in literacy, is the written communication allowing the learners to interact with peers and teachers. WTL draws on methods from socio-cultural theory, including continuous social interaction and written real-time formative feedback among peers, using shared electronic forums for collaboration, thereby providing social meaning and increased learning of literacy and mathematics, among both boys and girls.

    The study uses quantitative methods and two control groups, one using traditional method (no ICT) and one using technology individually (without integrated social interaction and formative feedback), to compare results from 502 students in grade 3 national tests in mathematics and literacy. WTL yields by far best results; higher average score both in literacy and mathematics, smaller gender gap, and significantly better results for the under-achievers. The ITU method performs worst, which shows that ICT use must be well integrated into the pedagogy to be useful.

  • 71.
    Agélii Genlott, Annika
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Grönlund, Åke
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Viberg, Olga
    KTH, Royal Institute of Technology, Stockholm, Sweden.
    Disseminating digital innovation in school: leading second-order educational change2019Ingår i: Education and Information Technologies: Official Journal of the IFIP technical committee on Education, ISSN 1360-2357, E-ISSN 1573-7608, Vol. 24, nr 5, s. 3021-3039Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Using digital technology effectively in schools requires profound changes in traditional teaching and learning activities. Pedagogical innovations often start small-scale and developing good ideas into shared practice across schools is challenging in many ways, especially if the innovation requires second-order change, i.e. challenges to fundamental beliefs about teaching and learning. This study investigates how a validated pedagogical method requiring integrated Information and Communication Technology (ICT) use and second-order change can be disseminated and sustained over time. We surveyed 92 primary school teachers who at different times over a 5-year period participated in a training course designed to implement an innovative technology-supported teaching method, Write To Learn, across an entire city. We found that organized teacher development programs can drive second-order change, but this requires considerable, active, and sustained effort from leaders at both school and district level. Additional factors include immediate and extended social systems and handling diversity among teachers. The results are useful for both practitioners and researchers since they contribute to a deeper understanding of the opportunities and challenges involved in disseminating effective ICT-based methods that requires profound changes of thinking about teaching and learning to guide the transformation of teaching practice.

  • 72.
    Agélii Genlott, Annika
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Grönlund, Åke
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Viberg, Olga
    Royal Institute of Technology in Stockholm (KTH), Stockholm, Sweden.
    Disseminating digital, science-based innovation in education: a leadership challengeManuskript (preprint) (Övrigt vetenskapligt)
  • 73.
    Agélii Genlott, Annika
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Orebro Univ, Sch Business, Informat, Orebro, Sweden..
    Grönlund, Åke
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Viberg, Olga
    Royal Institute of Technology in Stockholm (KTH), Stockholm, Sweden.
    Andersson, Annika
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Leading dissemination of digital, science-based innovation in school - a case study2023Ingår i: Interactive Learning Environments, ISSN 1049-4820, E-ISSN 1744-5191, Vol. 31, nr 7, s. 4171-4181Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Digitalizing school is a process that comes with challenges. It requires strategic leadership and transformational change to work processes. Nevertheless, some succeed, and it is useful to understand what makes for success. This paper studies the challenges of leading digitalization of education in a city which decided to implement an IT-supported method for teaching literacy in primary schools. The method required transformational change; teachers not only had to learn to use technologies, they also had to review their pedagogy. This study is guided by the Diffusion of Innovation theory and draws on interviews with school principals. We find that the critical factors relate to the communication channel, the social system within and across schools, and the time perspective.

  • 74.
    Ahdrian, Micaela
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Nilsson, Annika
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Marknadskanalsystemets evolution på den svenska klädmarknaden 1991-2012: En dominant design-analys2013Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
  • 75.
    Ahlberg, Annéa
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Andersson, Sarah
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Intentioner till hållbart konsumentbeteende: Med fokus på hållbara fonder2015Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 76.
    Ahlberg, Filip
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Öberg, Erik
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Hur demografiska faktorer påverkarförståelsen av teknisk skuld; en kvantitativjämförelse.2023Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 77.
    Ahlberg, Joakim
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Analysis of discrete multi-unit, common value auctions: a study of three sealed-bid mechanismsManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    This paper proposes a discrete bidding model for both quantities and pricing. It has a two-unit demand environment where subjects bid for contracts with an unknown redemption value, common to all bidders. Prior to bidding, the bidders receive private signals of information on the (common) value. The value and the signals are drawn from a known discrete affiliated joint distribution. The relevant task for the paper is to compare the equilibrium strategies and the seller’s revenue of three auction formats. We find that, of the three auctionformats below with two players, the discriminatory auction always gives the largest revenue to the seller; both the uniform and the Vickrey auction have zero revenue equilibrium strategies that put them further down in the revenue ranking. In equilibrium, bidders bid the same amount on both items in the discriminatory auction; a phenomenon not noted in either of the other auction formats.

  • 78.
    Ahlberg, Joakim
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Multi-unit common value auctions: a laboratory experiment with three sealed-bid mechansimsManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    This study addresses a discrete common value environment with independent (one-dimensional) private signals, where the seller offers two identical units and the buyers have (flat) demand for both. Each session is conducted with2, 3 or 4 buyers. Three auction formats are used: the discriminatory, uniformand Vickrey auctions which are all subjected to a variation in the number of bidders and to repeating bid rounds on each subject. The main findings are that there are no significant differences between the uniform and the discriminatory auction in collecting revenue, while the Vickrey auction comes out as inferior. More bidders in the auction result in a greater revenue and level out the performance across the mechanisms. Demand reduction is visible in the experiment, but it is not as prominent as anticipated. Moreover, subjects come closer to equilibrium play over time. Finally, the winner’s curse is less severe than what is reported for inexperienced bidders in other studies.

  • 79.
    Ahlberg, Joakim
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Multi-unit common value auctions: an experimental comparison between the static and the dynamic uniform auctionManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    It is still an open question whether the dynamic or the static format should be used in multi-unit settings, in a uniform price auction. The present study conducts an economic experiment in a common value environment, where it is found that it is more a question of whether the auctioneer wants to facilitate price discovery, and thereby lessen the otherwise pervasive overbidding, or if only the revenue is important. The experiment in the present paper provides evidence that the static format gives a significantly greater revenue than the dynamic auction, in both small and large group sizes. But a higher revenue comes at a cost; half of the auctions in the static format yield negative profits to the bidders, the winner’s curse is more severely widespread in the static auction, and only a minority of the bidders use the equilibrium bidding strategy.

  • 80.
    Ahlberg, Joakim
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Multi-unit common value auctions: theory and experiments2012Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Research on auctions that involve more than one identical item for sale was,almost non-existing in the 90’s, but has since then been getting increasing attention. External incentives for this research have come from the US spectrum, sales, the European 3G mobile-phone auctions,  and Internet auctions. The policy relevance and the huge amount of money involved in many of them have helped the theory and experimental research advance. But in auctions where values are equal across bidders, common value auctions, that is, when the value depends on some outside parameter, equal to all bidders, the research is still embryonic.

    This thesis contributes to the topic with three studies. The first uses a Bayesian game to model a simple multi-unit common value auction, the task being to compare equilibrium strategies and the seller’s revenue from three auction formats; the discriminatory, the uniform and the Vickrey auction. The second study conducts an economic laboratory experiment on basis of the first study. The third study comprises an experiment on the multi-unit common value uniform auction and compares the dynamic and the static environments of this format.

    The most salient result in both experiments is that subjects overbid. They are victims of the winner’s curse and bid above the expected value, thus earning a negative profit. There is some learning, but most bidders continue to earn a negative profit also in later rounds. The competitive effect when participating in an auction seems to be stronger than the rationality concerns. In the first experiment, subjects in the Vickrey auction do somewhat better in small groups than subjects in the other auction types and, in the second experiment, subjects in the dynamic auction format perform much better than subjects in the static auction format; but still, they overbid.

    Due to this overbidding, the theoretical (but not the behavioral) prediction that the dynamic auction should render more revenue than the static fails inthe second experiment. Nonetheless, the higher revenue of the static auction comes at a cost; half of the auctions yield negative profits to the bidders, and the winner’s curse is more severely widespread in this format. Besides, only a minority of the bidders use the equilibrium bidding strategy.The bottom line is that the choice between the open and sealed-bid formats may be more important than the choice of price mechanism, especially in common value settings.

    Delarbeten
    1. Analysis of discrete multi-unit, common value auctions: a study of three sealed-bid mechanisms
    Öppna denna publikation i ny flik eller fönster >>Analysis of discrete multi-unit, common value auctions: a study of three sealed-bid mechanisms
    (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    This paper proposes a discrete bidding model for both quantities and pricing. It has a two-unit demand environment where subjects bid for contracts with an unknown redemption value, common to all bidders. Prior to bidding, the bidders receive private signals of information on the (common) value. The value and the signals are drawn from a known discrete affiliated joint distribution. The relevant task for the paper is to compare the equilibrium strategies and the seller’s revenue of three auction formats. We find that, of the three auctionformats below with two players, the discriminatory auction always gives the largest revenue to the seller; both the uniform and the Vickrey auction have zero revenue equilibrium strategies that put them further down in the revenue ranking. In equilibrium, bidders bid the same amount on both items in the discriminatory auction; a phenomenon not noted in either of the other auction formats.

    Nyckelord
    Laboratory Experiment; Multi-Unit Auction; Common Value Auction
    Nationell ämneskategori
    Ekonomi och näringsliv
    Forskningsämne
    Nationalekonomi
    Identifikatorer
    urn:nbn:se:oru:diva-26445 (URN)
    Tillgänglig från: 2012-11-16 Skapad: 2012-11-16 Senast uppdaterad: 2023-02-14Bibliografiskt granskad
    2. Multi-unit common value auctions: a laboratory experiment with three sealed-bid mechansims
    Öppna denna publikation i ny flik eller fönster >>Multi-unit common value auctions: a laboratory experiment with three sealed-bid mechansims
    (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    This study addresses a discrete common value environment with independent (one-dimensional) private signals, where the seller offers two identical units and the buyers have (flat) demand for both. Each session is conducted with2, 3 or 4 buyers. Three auction formats are used: the discriminatory, uniformand Vickrey auctions which are all subjected to a variation in the number of bidders and to repeating bid rounds on each subject. The main findings are that there are no significant differences between the uniform and the discriminatory auction in collecting revenue, while the Vickrey auction comes out as inferior. More bidders in the auction result in a greater revenue and level out the performance across the mechanisms. Demand reduction is visible in the experiment, but it is not as prominent as anticipated. Moreover, subjects come closer to equilibrium play over time. Finally, the winner’s curse is less severe than what is reported for inexperienced bidders in other studies.

    Nyckelord
    Laboratory Experiment, Multi-Unit Auction, Common Value Auction
    Nationell ämneskategori
    Ekonomi och näringsliv
    Forskningsämne
    Nationalekonomi
    Identifikatorer
    urn:nbn:se:oru:diva-26446 (URN)
    Tillgänglig från: 2012-11-16 Skapad: 2012-11-16 Senast uppdaterad: 2023-02-14Bibliografiskt granskad
    3. Multi-unit common value auctions: an experimental comparison between the static and the dynamic uniform auction
    Öppna denna publikation i ny flik eller fönster >>Multi-unit common value auctions: an experimental comparison between the static and the dynamic uniform auction
    (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    It is still an open question whether the dynamic or the static format should be used in multi-unit settings, in a uniform price auction. The present study conducts an economic experiment in a common value environment, where it is found that it is more a question of whether the auctioneer wants to facilitate price discovery, and thereby lessen the otherwise pervasive overbidding, or if only the revenue is important. The experiment in the present paper provides evidence that the static format gives a significantly greater revenue than the dynamic auction, in both small and large group sizes. But a higher revenue comes at a cost; half of the auctions in the static format yield negative profits to the bidders, the winner’s curse is more severely widespread in the static auction, and only a minority of the bidders use the equilibrium bidding strategy.

    Nyckelord
    Laboratory Experiment, Multi-Unit Auction, Common Value Auction
    Nationell ämneskategori
    Ekonomi och näringsliv
    Forskningsämne
    Nationalekonomi
    Identifikatorer
    urn:nbn:se:oru:diva-26447 (URN)
    Tillgänglig från: 2012-11-16 Skapad: 2012-11-16 Senast uppdaterad: 2023-02-14Bibliografiskt granskad
    Ladda ner fulltext (pdf)
    fulltext
    Ladda ner (pdf)
    cover
    Ladda ner (pdf)
    spikblad
  • 81.
    Ahlbom, Ivan
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Borojevic, Dario
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Ohlsson Holmberg, Josef
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Dark patterns och persuasive design. Hur påverkar de UX-designers arbete och etiska ställningstaganden?2020Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 82.
    Ahle, Julius
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Alfredéen, Daniel
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Home bias i svenska aktiefonder: En undersökning av tio globala aktiefonder och deras allokering i hemlandet2024Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    Home bias i svenska aktiefonder
  • 83.
    Ahlgren, Thomas
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Stenman, Martin
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    En undersökning av lösenordskvalitet på e-handelsplatser2020Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 84.
    Ahlgren, Tobias
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Gustafsson Stahle, Adam
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Är det inte hållbart, så är det inte hållbart: En kvalitativ fallstudie om hur ett företag inom den svenska skogsindustrin hanterar den institutionella komplexiteten mellan miljömässig CSR och lönsamhet2022Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    Är det inte hållbart, så är det inte hållbart” En kvalitativ fallstudie om hur ett företag inom den svenska skogsindustrin hanterar den institutionella komplexiteten mellan miljömässig CSR och lönsamhet.
  • 85.
    Ahlgren, William
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Osterman, Mette
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Wäcklèn, Daniel
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Organisationsförändringars inflytande på relationer mellan ledare och medarbetare2022Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 86.
    Ahlin, Cecilia
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Svenning, Kajsa
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Legitimitet genom hållbarhetsredovisning: En studie om hur företag inom klädbranschen reparerar ochupprätthåller legitimitet efter negativ publicitet i nyhetsmedia2020Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 87.
    Ahlinder Rydberg, Klara
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Sticka ut eller smälta in?: En longitudstudie av hållbarhetsrapporter utgivna av företag i samma bransch2022Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
  • 88. Ahlquist, Martin
    et al.
    Borglund, Tommy
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Medierna och etiken: ansvar i ett nytt medielandskap2017 (uppl. 1)Bok (Övrigt vetenskapligt)
  • 89.
    Ahlqvist, Fabian
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Lagerstedt Ekholm, Viggo
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Det ska vara lätt att göra rätt - En uppsats om hälso- och sjukvårdsorganisationers arbete med informationssäkerhetskultur för att motverka icke-illvilliga informationssäkerhetsincidenter2022Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
  • 90.
    Ahlqvist, Fanny Viktoria
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Besic, Mersiha
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Sultan, Filli Elyas
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Belöningssystemens inverkan på arbetsmotivationen -En fallstudie av åtta anställdas uppfattningar inom två olika yrkeskategorier i Thule group2016Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
  • 91.
    Ahlroos Åkerlind, Louise
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Sörensson Wattrang, Christoffer
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    En bransch i ständig kris En kvalitativ studie om medarbetares perspektiv på hotellverksamheters Employer branding2021Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
  • 92.
    Ahlsson, Anders
    et al.
    Örebro universitet, Institutionen för hälsovetenskap och medicin. Department of Cardiothoracic Surgery and Anesthesiology, Örebro University Hospital, Örebro, Sweden.
    Bodin, Lennart
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Department of Statistics and Epidemiology, Örebro University Hospital, Örebro, Sweden.
    Fengsrud, Espen
    Örebro universitet, Institutionen för hälsovetenskap och medicin. Department of Cardiology, Örebro University Hospital, Örebro, Sweden.
    Englund, Anders
    Örebro universitet, Hälsoakademin. Department of Cardiology, Örebro University Hospital, Örebro, Sweden.
    Patients with postoperative atrial fibrillation have a doubled cardiovascular mortality2009Ingår i: Scandinavian cardiovascular journal : SCJ, ISSN 1651-2006, Vol. 43, nr 5, s. 330-336Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    OBJECTIVES: To investigate the impact of postoperative AF on late mortality and cause of death in CABG patients.

    DESIGN: All CABG patients without preoperative AF surgically treated between January 1, 1997 and June 30, 2000 were included (N = 1419). Altogether, 419 patients (29.5%) developed postoperative AF. After a median follow-up of 8.0 years, survival data were obtained, causes of death were compared and Cox proportional hazard analysis was used to determine predictors of late mortality.

    RESULTS: The total mortality was 140 deaths/419 patients (33.4%) in postoperative AF patients and 191 deaths/1 000 patients (19.1%) in patients without AF. Death due to cerebral ischemia (2.6% vs. 0.5%), myocardial infarction (7.4% vs. 3.0%), sudden death (2.6% vs. 0.9%), and heart failure (6.7% vs. 2.7%) was more common among postoperative AF patients. Postoperative AF was an age-independent risk indicator for late mortality with a hazard ratio (HR) of 1.56 (95% confidence interval 1.23-1.98).

    CONCLUSIONS: Postoperative AF is an age-independent risk factor for late mortality in CABG patients, explained by an increased risk of cardiovascular death.

  • 93.
    Ahlstrand, Jessica
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Kraft, Emilia
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Väkiparta, Ada
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Kompetensutveckling i stora redovisningsbyråer: En studie om hur stora redovisningsbyråer främjar kompetensutveckling i lärande organisationer2020Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
  • 94.
    Ahlstrand, Jonathan
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Karlsson, Andreas
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Samexisterande logiker bland mindre re-visions- och redovisningsbyråer: En kvalitativ studie i hur byråerna identifierar sig och svarar på samexisterande logiker2020Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 95.
    Ahlstrand, Jonathan
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Karlsson, Andreas
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Söderström, Max
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Kvinnlig representation i ersättningsutskott: En kvantitativ studie om samband mellan könsfördelning och rörlig kompensation2019Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 96.
    Ahlstrand, Lina
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Enocsson, Samuel
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Ålgars, Oskar
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Hur påverkar digitaliseringen redovisningsenheter?: En kvalitativ studie om operativa risker och riskhanteringsprocessen2021Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 97.
    Ahlström, Filip
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Tholfsson, Adam
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Samarbete i projektgrupper: En fallstudie om ekonomisk information som boundary object2020Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 98.
    Ahlström, Filip
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Tholfsson, Adam
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Wreeth, Jesper
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Engagemang till förbättringsarbete: Med utgångspunkt från förväntansteorin2019Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 99.
    Ahlén, Jonathan
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Hur empiriskt relevant är Taylor Rule idag?: En jämförelse av Sverige och USA.2017Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    Hur empiriskt relevant är Taylor Rule idag?:
  • 100.
    Ahlén, Jonathan
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Policy Uncertainty Shocks in a Small Open Economy2019Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
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