The Use of the lz and lz Person-Fit Statistics and Problems Derived From Model Misspecification

We extend a recent didactic by Magis, Raîche, and Béland on the use of the lz and lz * person-fit statistics. We discuss a number of possibly confusing details and show that it is important to first investigate item response theory model fit before assessing person fit. Furthermore, it is argued tha...

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Bibliographic Details
Published in:Journal of educational and behavioral statistics 2012-12, Vol.37 (6), p.758-766
Main Authors: Meijer, Rob R., Tendeiro, Jorge N.
Format: Article
Language:English
Subjects:
Item response theory
Statistics
Theory
Validity scales
Online Access:Get full text
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Summary:We extend a recent didactic by Magis, Raîche, and Béland on the use of the lz and lz * person-fit statistics. We discuss a number of possibly confusing details and show that it is important to first investigate item response theory model fit before assessing person fit. Furthermore, it is argued that appropriate distributions are only a first step for practical use of person-fit statistics.
ISSN:1076-9986
1935-1054
DOI:10.3102/1076998612466144