Title: Determination of a reference value, associated standard uncertainty and degrees of equivalence for CCRI(II) key comparison data
Authors: POMME Stefaan
Publisher: Publications Office of the European Union
Publication Year: 2012
JRC N°: JRC71285
ISBN: 978-92-79-25104-7
ISSN: 1831-9424
Other Identifiers: EUR 25355 EN
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC71285
DOI: 10.2787/61338
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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