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Limits of tolerance and z-scores in ring tests

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Abstract

 A series of objections are discussed to the use of symmetrical tolerance intervals in ring tests as part of a procedure for laboratory assessment. Instead, a modified, asymmetrical tolerance interval is introduced which takes these objections into consideration. A modified z-score is proposed corresponding to the modified tolerance interval.

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Authors and Affiliations

  1. Freie Universität Berlin, Garystrasse 21, D-14195 Berlin, Germany, , , , , , DE

    S. Uhlig

  2. Umweltbundesamt, Bismarckplatz 1, D-14193 Berlin, Germany, , , , , , DE

    P. Henschel

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  1. S. Uhlig
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  2. P. Henschel
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Received: 24 June 1996/Revised: 14 February 1997/Accepted: 22 February 1997

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Uhlig, S., Henschel, P. Limits of tolerance and z-scores in ring tests. Fresenius J Anal Chem 358, 761–766 (1997). https://doi.org/10.1007/s002160050505

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  • DOI: https://doi.org/10.1007/s002160050505

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