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Treatment of uncorrected measurement bias in uncertainty estimation for chemical measurements
SP - Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
2008 (English)In: Anal Bioanl Chem., Vol. 390, 201-213 p.Article in journal (Refereed) Published
Abstract [en]

Consistent treatment of measurement bias, including the question of whether or not to correct for bias, is essential for the comparability of measurement results. The case for correcting for bias is discussed, and it is shown that instances in which bias is known or suspected, but a specific correction cannot be justified, are comparatively common. The ISO Guide to the Expression of Uncertainty in Measurement does not provide well for this situation. It is concluded that there is a need for guidance on handling cases of uncorrected bias. Several different published approaches to the treatment of uncorrected bias and its uncertainty are critically reviewed with regard to coverage probability and simplicity of execution. On the basis of current studies, and taking into account testing laboratory needs for a simple and consistent approach with a symmetric uncertainty interval, we conclude that for most cases with large degrees of freedom, linear addition of a bias term adjusted for exact coverage (“Ue”) as descibed by Synek is to be preferred. This approach does, however, become more complex if degrees of freedom are low. For modest bias and low degrees of freedom, summation of bias, bias uncertainty and observed value uncertainty in quadrature (“RSSu”) provides a similar interval and is simpler to adapt to reduced degrees of freedom, at the cost of a more restricted range of application if accurate coverage is desired.

Place, publisher, year, edition, pages
2008. Vol. 390, 201-213 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6087Local ID: 9454OAI: oai:DiVA.org:ri-6087DiVA: diva2:963922
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2016-09-26Bibliographically approved

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