Journal
MEASUREMENT-INTERDISCIPLINARY RESEARCH AND PERSPECTIVES
Volume 11, Issue 3, Pages 71-101Publisher
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
DOI: 10.1080/15366367.2013.831680
Keywords
maximum likelihood; latent class; categorical data; discrete data; model selection; ordinal factor analysis; polychoric correlation
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Funding
- ICREA-Academia Award
- Catalan government [SGR 2009 74]
- Spanish Ministry of Education [PSI2009-07726]
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The article provides an overview of goodness-of-fit assessment methods for item response theory (IRT) models. It is now possible to obtain accurate p-values of the overall fit of the model if bivariate information statistics are used. Several alternative approaches are described. As the validity of inferences drawn on the fitted model depends on the magnitude of the misfit, if the model is rejected it is necessary to assess the goodness of approximation. With this aim in mind, a class of root mean squared error of approximation (RMSEA) is described, which makes it possible to test whether the model misfit is below a specific cutoff value. Also, regardless of the outcome of the overall goodness-of-fit assessment, a piece-wise assessment of fit should be performed to detect parts of the model whose fit can be improved. A number of statistics for this purpose are described, including a z statistic for residual means, a mean-and-variance correction to Pearson's X-2 statistic applied to each bivariate subtable separately, and the use of z statistics for residual cross-products.
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