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