Issue 28, 2016

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

Article information

Article type
AMC Technical Brief
Submitted
19 May 2016
First published
05 Jul 2016

Anal. Methods, 2016,8, 5553-5555

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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