Methodology Review: Evaluating Person Fit

Rob R. Meijer, Klaas Sijtsma

Research output: Contribution to journalArticleAcademic

281 Citations (Scopus)
2 Downloads (Pure)


Person-fit methods based on classical test theory-and item response theory (IRT), and methods investigating particular types of response behavior on tests, are examined. Similarities and differences among person-fit methods and their advantages and disadvantages are discussed. Sound person-fit methods have been derived for the Rasch model. For other IRT models, the empirical and theoretical distributions differ for most person-fit statistics when used with short and moderate length tests. The detection rate of person-fit statistics depends on the type of misfitting item-score patterns, test length, and trait levels. The usefulness of person-fit statistics for improving measurement depends on the application.
Original languageEnglish
Pages (from-to)107-135
Number of pages28
JournalApplied psychological measurement
Issue number2
Publication statusPublished - 2001


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