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ERIC Number: EJ1023617
Record Type: Journal
Publication Date: 2013
Pages: 31
Abstractor: As Provided
Reference Count: 48
ISBN: N/A
ISSN: ISSN-1536-6367
Goodness-of-Fit Assessment of Item Response Theory Models
Maydeu-Olivares, Alberto
Measurement: Interdisciplinary Research and Perspectives, v11 n3 p71-101 2013
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 Chi[superscript 2] statistic applied to each bivariate subtable separately, and the use of "z" statistics for residual cross-products.
Psychology Press. Available from: Taylor & Francis, Ltd. 325 Chestnut Street Suite 800, Philadelphia, PA 19106. Tel: 800-354-1420; Fax: 215-625-2940; Web site: http://www.tandf.co.uk/journals
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Chile