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Procedures for Estimating Confidence Intervals for Selected Method Performance Parameters

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Procedures for estimating confidence intervals (CIs) for the repeatability variance (σr 2), reproducibility variance (σR 2 = σL 2 + σr 2), laboratory component (σL 2), and their corresponding standard deviations σr, σR, and σL, respectively, are presented. In addition, CIs for the ratio of the repeatability component to the reproducibility variance (σr 2R 2) and the ratio of the laboratory component to the reproducibility variance (σL 2R 2) are also presented.

Document Type: Research Article

Affiliations: U.S. Department of Health and Human Services, Food and Drug Administration, Center for Food Safety and Applied Nutrition, Office of Scientific Analysis and Support, Division of Mathematics, 200 C St, SW, Washington, DC 20204.

Publication date: May 1, 2001

More about this publication?
  • The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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