Statistical treatment of proficiency testing data |
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Authors: | Daniel William Tholen |
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Institution: | (1) Statistical Consulting Services, 823 Webster Street, Traverse City, MI 49686, USA Tel.: +1-616-9291721 Fax: +1-616-9292770 e-mail: tholen@traverse.com, US |
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Abstract: | There are three stages to evaluating a laboratory's results in an interlaboratory proficiency test: establishing the correct
result for the test item, determining an evaluation statistic for the particular result, and establishing an acceptable range.
There are a wide variety of procedures for accomplishing these three stages and a correspondingly wide variety of statistical
techniques in use. Currently in North America the largest number of laboratory proficiency test programs are in the clinical
laboratory field, followed by programs for environmental laboratories that test drinking water and waste water. Proficiency
testing in both of these fields is under the jurisdiction of the federal government and other regulatory and accreditation
agencies. Many of the statistical procedures are specified in the regulations, to assure comparability of different programs
and a fair evaluation of performance. In this article statistical procedures recommended in International Organization for
Standardization Guide 43, Part 1, are discussed and compared with current practices in North America.
Received: 22 April 1998 · Accepted: 12 May 1998 |
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Keywords: | Proficiency testing Interlaboratory comparison Laboratory Accreditation Statistical methods |
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