Issue 18, 2014

Unbalanced robust ANOVA for the estimation of measurement uncertainty at reduced cost

Abstract

An empirical estimation of the random components of measurement uncertainty arising from the sampling and analytical processes can be made via an experiment involving replication. Analysis of variance (ANOVA) is then used to estimate the variance components. However, the fully balanced design is unduly costly, requiring four analyses per sampling target. This cost can be reduced by 25% by using an unbalanced design. Robust ANOVA in this context is often a useful tool, as it gives a more representative estimate of the separate variances than classical ANOVA when outlying results are encountered, but software for executing unbalanced robust ANOVA has hitherto been unavailable. This Technical Brief introduces the unbalanced design and the corresponding software provided by the AMC.

Graphical abstract: Unbalanced robust ANOVA for the estimation of measurement uncertainty at reduced cost

Article information

Article type
AMC Technical Brief
Submitted
10 Jul 2014
First published
08 Aug 2014

Anal. Methods, 2014,6, 7110-7111

Unbalanced robust ANOVA for the estimation of measurement uncertainty at reduced cost

Analytical Methods Committee, AMCTB No 64, Anal. Methods, 2014, 6, 7110 DOI: 10.1039/C4AY90062F

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