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Issue 28, 2016
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z-Scores and other scores in chemical proficiency testing—their meanings, and some common misconceptions

Abstract

z-Scores were devised to provide a transparent but widely-applicable scoring system for participants in proficiency tests for analytical laboratories. The essential idea is to provide an appropriate scaling of the difference between a participant’s result and the ‘assigned value’ for the concentration of the analyte. Interpretation of a z-score is straightforward but some aspects need careful attention to avoid misconception. Over time several related scores have been devised to cope with a diversified range of applications. The main types of score have recently been codified in ISO 13528 (2015).

Graphical abstract: z-Scores and other scores in chemical proficiency testing—their meanings, and some common misconceptions

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Article information


Submitted
19 May 2016
First published
05 Jul 2016

Anal. Methods, 2016,8, 5553-5555
Article type
AMC Technical Brief

z-Scores and other scores in chemical proficiency testing—their meanings, and some common misconceptions

Analytical Methods Committee, AMCTB No. 74, Anal. Methods, 2016, 8, 5553
DOI: 10.1039/C6AY90078J

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