Uncertainty evaluation in proficiency testing: state-of-the-art, challenges, and perspectives |
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Authors: | Adriaan M H van der Veen |
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Institution: | (1) Nederlands Meetinstituut, Schoemakerstraat 97, 2628 VK Delft, The Netherlands e-mail: avdveen@nmi.nl Tel.: +31-15-269-1733 Fax: +31-15-261-2971, NL |
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Abstract: | The evaluation of measurement uncertainty, and that of uncertainty statements of participating laboratories will be a challenge
to be met in the coming years. The publication of ISO 17025 has led to the situation that testing laboratories should, to
a certain extent, meet the same requirements regarding measurement uncertainty and traceability. As a consequence, proficiency
test organizers should deal with the issues measurement uncertainty and traceability as well. Two common statistical models
used in proficiency testing are revisited to explore the options to include the evaluation of the measurement uncertainty
of the PTRV (proficiency test reference value). Furthermore, the use of this PTRV and its uncertainty estimate for assessing
the uncertainty statements of the participants for the two models will be discussed. It is concluded that in analogy to Key
Comparisons it is feasible to implement proficiency tests in such a way, that the new requirements can be met.
Received: 29 September 2000 Accepted: 3 December 2000 |
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Keywords: | Proficiency testing Measurement uncertainty Reference value Consensus value Assessment of laboratories |
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