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Transfer Standard Uncertainty Can Cause Inconclusive Inter-Laboratory Comparisons
National Institute of Standards and Technology (NIST), Gaithersburg MD, United States.
National Institute of Standards and Technology (NIST), Gaithersburg MD, United States.
Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany.
Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany.
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2016 (English)In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 53, no 6, p. 1243-1258, article id 28090123Article in journal (Refereed) Published
Abstract [en]

Inter-laboratory comparisons use the best available transfer standards to check the participants' uncertainty analyses, identify underestimated uncertainty claims or unknown measurement biases, and improve the global measurement system. For some measurands, instability of the transfer standard can lead to an inconclusive comparison result. If the transfer standard uncertainty is large relative to a participating laboratory's uncertainty, the commonly used standardized degree of equivalence ≤ 1 criterion does not always correctly assess whether a participant is working within their uncertainty claims. We show comparison results that demonstrate this issue and propose several criteria for assessing a comparison result as passing, failing, or inconclusive. We investigate the behavior of the standardized degree of equivalence and alternative comparison measures for a range of values of the transfer standard uncertainty relative to the individual laboratory uncertainty values. The proposed alternative criteria successfully discerned between passing, failing, and inconclusive comparison results for the cases we examined.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. Vol. 53, no 6, p. 1243-1258, article id 28090123
Keywords [en]
comparison, gree of equivalence, transfer standard uncertainty
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:oru:diva-76710DOI: 10.1088/0026-1394/53/6/1243ISI: 000386015600002Scopus ID: 2-s2.0-85001975526OAI: oai:DiVA.org:oru-76710DiVA, id: diva2:1354119
Note

Funding Agency:

Intramural NIST DOC  9999-NIST

Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2020-02-14Bibliographically approved

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Bodnar, Olha

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