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Use of the 'characteristic function' for modelling repeatability precision

Thompson, Michael and Coles, B.J. (2011) Use of the 'characteristic function' for modelling repeatability precision. Accreditation and Quality Assurance 16 (1), pp. 13-19. ISSN 0949-1775.

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Official URL: http://dx.doi.org/10.1007/s00769-010-0719-0

Abstract

The 'characteristic function' is a two-parameter function relating precision or uncertainty in analytical results to the concentration of the analyte. In previous papers, in this series, it has been shown to provide a good model of precision measured: (a) under reproducibility conditions and (b) under 'instrumental' conditions. The present study shows that it is also a valuable model for precision estimated under repeatability conditions. The study data were large sets of duplicated results obtained for the purposes of quality control on typical test materials in routine analysis. As the analytes exhibited concentration ranges encompassing between one and three orders of magnitude, there was ample scope to demonstrate goodness of fit to the function under different circumstances.

Item Type: Article
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Earth and Planetary Sciences
Depositing User: Administrator
Date Deposited: 17 Jun 2011 11:32
Last Modified: 17 Apr 2013 12:20
URI: http://eprints.bbk.ac.uk/id/eprint/3729

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