Abstract
A meta-analysis of statistics from many proficiency tests has demonstrated the wide applicability of a simple model of reproducibility (interlaboratory) standard deviation. The function has already been proposed as a model for uncertainty in an analytical system, that is, a defined method, analyte and matrix type. The function is a two-parameter model with the concentration of the analyte as the single predictor variable. In this study it is applied to statistics derived from results of an international proficiency test covering many different analytes and matrix types in the food analysis sector. In nearly all instances tested the model accounted well for the observed statistics and could be used as a compact description of the performance of the analytical system.
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