Statistical analysis of method comparison data. Testing normality

G. S. Cembrowski, J. O. Westgard, W. J. Conover, E. C. Toren

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


A Lilliefors test of normality has been applied to data from precision and accuracy studies. Most data sets tested as non-normal. Simulation studies showed that the test is extremely sensitive to the rounded, narrowly distributed data that are typical of method performance studies in clinical chemistry. The Lilliefors test can be modified to be applicable to rounded data so that it gives fewer indications of non-normality. The authors conclude that the selection of a test of normality requires careful study of the properties of the test. Otherwise, the subsequent choice between parametric and nonparametric statistics may not be meaningful.

Original languageEnglish
Pages (from-to)21-26
Number of pages6
JournalAmerican Journal of Clinical Pathology
Issue number1
StatePublished - 1979


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