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|Title:||Determination of the standard deviation for proficiency assessment from past participant’s performances|
|Authors:||COTE Isabelle; ROBOUCH Piotr; ROBOUCH B.v.; BISSON David; GAMACHE Philippe; LEBLANC Alain; DUMAS Pierre; PEDNEAULT Michael|
|Citation:||ACCREDITATION AND QUALITY ASSURANCE vol. 17 no. 4 p. 389-393|
|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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