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Person fit assessment using the PerFit package in R

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Doi: 10.20982/tqmp.12.3.p232

Mousavi, Amin , Tendeiro, Jorge N. , Younesi, Jalil
Keywords: Person fit , Item response theory , Aberrant responding , Test validity
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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.

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