How many IRT parameters does it take to model psychopathology items?

Abstract

The authors compared the fit of the 2- and 3-parameter logistic models (2PLM; 3PLM) on 15 unidimensional factor scales derived from the Minnesota Multiphasic Personality Inventory--Adolescent item pool. Log-likelihood chi-square deviance tests indicated that a 3PLM provided an improved fit. However, residual statistics indicated that the difference in fit… (More)

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Cite this paper

@article{Reise2003HowMI, title={How many IRT parameters does it take to model psychopathology items?}, author={Steven P. Reise and Niels G. Waller}, journal={Psychological methods}, year={2003}, volume={8 2}, pages={164-84} }