Determination of a reference value, associated standard uncertainty and degrees of equivalence for CCRI(II) key comparison data
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.
POMME Stefaan;
2012-12-03
Publications Office of the European Union
JRC71285
978-92-79-25104-7,
1831-9424,
EUR 25355 EN,
OP LA-NA-25355-EN-N,
https://publications.jrc.ec.europa.eu/repository/handle/JRC71285,
10.2787/61338,
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