The ‘Horwitz ratio’—a study of the ratio between reproducibility and repeatability precisions in the analysis of foodstuffs
Thompson, Michael and Woodgate, R. (2015) The ‘Horwitz ratio’—a study of the ratio between reproducibility and repeatability precisions in the analysis of foodstuffs. Analytical Methods 7 (1), pp. 375-379. ISSN 1759-9660.
Abstract
This paper examines precision statistics from collaborative trials (interlaboratory method performance studies) reported between 1990 and 2000. The principal focus is on the ‘Horwitz ratio’ (sR/sr), the ratio of the estimated standard deviations of reproducibility (sR) and repeatability (sr) found for individual analytical procedures. A predictable ratio would be a valuable tool in assessing uncertainty and detection limit. While the median ratio observed was close to 2.0, a significant variation with a strong positive skew was observed, much of which could be attributed to particular types of analyte, test material, and analytical procedure.
Metadata
Item Type: | Article |
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School: | Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences |
Depositing User: | Administrator |
Date Deposited: | 20 Jan 2015 13:33 |
Last Modified: | 02 Aug 2023 17:14 |
URI: | https://eprints.bbk.ac.uk/id/eprint/11478 |
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