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    Analyzing Interlaboratory Data According to ASTM Standard E691

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    ASTM Standard Practice E691-92 deals with the design and the analysis of the data of an interlaboratory study of a test method. This paper explains the procedure of E691 and goes beyond it in a discussion of the linear model analysis of interlaboratory test data. The explanations are illustrated in terms of a real set of interlaboratory data.


    Interlaboratory testing, h-graph, k-graph, Linear model, Outliers, Proficiency testing, repeatability, reproducibility

    Author Information:

    Mandel, J
    Guest Scientist, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland

    Committee/Subcommittee: E11.30

    DOI: 10.1520/STP13193S