Abstract
Interlaboratory comparison of the results of analytical procedures is important to delineate the presence or absence of accuracy and precision. As part of laboratory accreditation must depend on accurate analysis of the results of such interlaboratory trials, a reanalysis of the blood-lead values (Keppler et al., Amer. Ind. Hyg. Assoc. J. 31, 412, 1970) determined by 60 laboratories is presented. In the nonpara-metric procedures used, the outlying laboratories (those whose central tendency and those whose variability were abnormal) are clearly delineated. These outlying laboratories can, therefore, more easily attempt to correct their method of analysis, knowing how they compare with the majority of other laboratories.
Published Version
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