Proficiency testing in the light of a new rationale in metrology |
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Authors: | Kaj Heydorn |
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Institution: | (1) Department of Chemistry, Technical University of Denmark, DK 2800 Kgs. Lyngby, Denmark;(2) IBX International, Frederiksborgvej 127, DK 4000 Roskilde, Denmark |
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Abstract: | The novel proposed definition of measurement result in the international metrology vocabulary requires a revision of standards and guidelines for proficiency testing (PT), and
a new approach to processing proficiency data is needed to test the ability of laboratories to present not only unbiased quantity
values, but reliable estimates of their uncertainty. Hence, an accepted reference value with the smallest possible uncertainty
is needed to ascertain the proficiency of laboratories reporting results with lower than average uncertainty. A strategy based
on the T-statistic is proposed leading to an accepted reference value that fully reflects the uncertainties reported by participants
in a PT scheme and permits calculation of E
n
numbers to distinguish whether or not measurement results are consistent with the accepted definition of the measurand. The strategy
is applied to PT data from a recent international laboratory intercomparison of uranium isotopic ratios. |
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Keywords: | Proficiency testing E n numbers T-statistic Synthesis of precision Data processing strategies |
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