ITLApplied  Computational Mathematics Division
ACMD Seminar Series
Attractive Image NIST

Analysis of Uncertainty in Interlaboratory Evaluations Based on the ISO Guide .

Raghu Kacker

Tuesday, November 27, 2001 13:00-14:00,
Room 145, NIST North (820)
Tuesday, November 27, 2001 11:00-12:00,
Room 4550

Abstract: A substantial diversity exists in the literature on how to analyze the uncertainty in interlaboratory evaluations of a common measurand. The issues include the following. What is the combined result and what uncertainty is associated with it? What to do when the expanded uncertainty interval associated with the combined result excludes a non-negligible fraction of the individual laboratory results? We discuss these issues and propose a simple approach based on the ISO Guide to determine the combined result and the associated uncertainty so no reasonable result of measurement is excluded. We will illustrate the proposed approach through an application to the recent results of the international comparison of cryogenic radiometers organized by the Consultative Committee for Photometry and Radiometry (CCPR). In particular, we show how the proposed approach may be used to quantify the worldwide uncertainty in cryogenic radiometry.
Contact: A. J. Kearsley

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