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|Title:||Determination of a reference value, associated standard uncertainty and degrees of equivalence for CCRI(II) key comparison data|
|Publisher:||Publications Office of the European Union|
|Other Identifiers:||EUR 25355 EN|
|Type:||EUR - Scientific and Technical Research Reports|
|Abstract:||CCRI(II) key comparison data consist of a measured value of activity concentration, independently obtained, and the associated standard uncertainty for each laboratory participating in a key comparison. A method is proposed for calculating a key comparison reference value (KCRV), its associated standard uncertainty, and degrees of equivalence (DoE) for the laboratories. The estimator has the property that for increasingly discrepant data sets there is a smooth transition of the KCRV from the weighted mean to the arithmetic mean. It is a good compromise between efficiency and robustness, while providing also a reliable uncertainty. A suitable statistical criterion is provided to identify extreme data.|
|JRC Directorate:||Health, Consumers and Reference Materials|
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