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Evaluation of proficiency testing results taking into account their uncertainties |
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| Authors: | I Kuselman Ioannis Papadakis Wolfhard Wegscheider |
| Institution: | (1) The National Physical Laboratory of Israel (INPL), Givat Ram, Jerusalem 91904, Israel e-mail: kuselman@netvision.net.il Tel.: +972-2-6536534 Fax: +972-2-6520797, IL;(2) Institute for Reference Materials and Measurements, European Commission - JRC, Retieseweg, 2440 Geel, Belgium, BE;(3) Department of General and Analytical Chemistry, University of Leoben, Franz-Josef Strasse 18, 8700 Leoben, Austria, AT |
| Abstract: | A new composite score for the evaluation of performance of proficiency testing participants is proposed. The score is based on a combination of the z-score, uncertainty of a participant’s measurement result and uncertainty of the proficiency testing scheme’s assigned value. The use of such a composite score will allow evaluation not only of the participant’s ability to determine an analyte in corresponding matrix, but also their understanding of the uncertainty in the obtained analytical result. The score may be helpful for the laboratory’s quality system and for laboratory accreditation according to ISO 17025. |
| Keywords: | Proficiency testing Uncertainty estimation Evaluation of performance z-score Statistics |
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