Person fit assessment using the PerFit package in R

Mousavi, A., Tendeiro, J. N. & Younesi, J., 2016, In : Quantitative methods for psychology. 12, 3, p. 232-242 11 p.

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The validity of scores derived from an educational or psychological testing situation determines the accuracy and appropriateness of inferences made about an examinee based on his/her test score. Person fit assessment provides a framework for assessing the conformity of a test score to a given measurement model or to a group of examinees as an indicator of validity/invalidity of the test score. This paper presents a brief overview of person fit assessment, the effect of person misfit on ability estimation, the PerFit R package as a powerful tool for person fit assessment, and two practical examples on how to use PerFit for person fit assessment.

Original languageEnglish
Pages (from-to)232-242
Number of pages11
JournalQuantitative methods for psychology
Issue number3
Publication statusPublished - 2016


  • Person fit, Item response theory, Aberrant responding, Test validity

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