, Volume 17, Issue 4, pp 389-393,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 19 Jun 2012

Determination of the standard deviation for proficiency assessment from past participant’s performances


The “uncertainty function” introduced by Thompson et al. estimates the reproducibility standard deviation as a function of concentration or mass fraction. This model was successfully applied to data derived from three proficiency testing schemes aiming at the quantification of cadmium, lead and mercury in blood and urine. This model allows the estimation of standard deviation for the performance assessment for proficiency testing rounds.