Analysis of the compatibility in an interlaboratory comparison process

Metrological comparisons test and quantify the agreement of the measurements performed in different laboratories to support equivalence statements. Central to the area of key comparison is the degree of equivalence of measurement standards and a "region" of compatibility including all the measurement results that are consistent with reference values may be individuated. The level of confidence of that region is a parameter qualifying the comparison. This paper considers an approach concerning the representation of a compatibility region in an interlaboratory comparison process based on the introduction of the probability intervals and evaluates the level of confidence of that region, giving an estimation of the uncertainty of the comparison process.