Person Fit

Authored by: Cees A. W. Glas , Naveed Khalid

Handbook of Item Response Theory

Print publication date:  December  2017
Online publication date:  December  2017

Print ISBN: 9781466514331
eBook ISBN: 9781315117430
Adobe ISBN:


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This chapter discusses methods for evaluating the fit of individual response patterns to an item response theory (IRT) model. These methods are based on so-called person-fit tests, which can be used to identify respondents that do not fit the IRT model, for instance, because their ability changes during test taking or because their item responses are not locally independent. The chapter starts with giving an overview of person-fit tests for dichotomously scored items, then tests for polytomously scored items are discussed, and finally, some examples pertaining to the application of the test statistics are given.

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