Title: Determination of the standard deviation for proficiency assessment from past participant’s performances
Authors: COTE IsabelleROBOUCH PiotrROBOUCH B.v.BISSON DavidGAMACHE PhilippeLEBLANC AlainDUMAS PierrePEDNEAULT Michael
Citation: ACCREDITATION AND QUALITY ASSURANCE vol. 17 no. 4 p. 389-393
Publisher: SPRINGER
Publication Year: 2012
JRC Publication N°: JRC72928
ISSN: 0949-1775
URI: http://link.springer.com/article/10.1007%2Fs00769-012-0906-2
http://publications.jrc.ec.europa.eu/repository/handle/JRC72928
DOI: 10.1007/s00769-012-0906-2
Type: Contributions to Conferences
Abstract: The “uncertainty function” introduced by Thompson et al. estimates the reproducibility standard deviation (SR) as a function of concentration. This model was successfully applied to a data set derived from three proficiency testing schemes aiming at the quantification of three toxic elements (cadmium, lead and mercury) in blood and urine. A threshold concentration was determined for each element. Below this concentration SR is found to be constant, while above it the reproducibility relative standard deviation is constant. This model allows the a priori estimation of standard deviation for performance assessment for proficiency testing rounds.
JRC Institute:Institute for Reference Materials and Measurements

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