Partial credit model: Estimations and tests of fit with pcmodel

Jean-Francois Hamel (), Veronique Sebille, Gaelle Challet-Bouju and Jean-Benoit Hardouin ()
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Jean-Francois Hamel: University Hospital of Angers
Veronique Sebille: University Hospital of Nantes
Gaelle Challet-Bouju: University Hospital of Nantes

Stata Journal, 2016, vol. 16, issue 2, 464-481

Abstract: The partial credit and rating scale models are classical models from item response theory; they belong to the generalized linear latent and mixed model family and allow one to analyze questionnaires such as patient-reported outcomes. Few goodness-of-fit testing procedures have been proposed for such models, and few computer programs implement such tests. Here we describe two tests: the R1m test (which tests the overall adequacy of the model to the data) and the Si test (which evaluates the contribution of each item to a possible lack of fit). We also propose two commands: pcmodel, which implements partial credit or rating scale models, and pcmtest, which tests the adequacy of such models to the data.

Keywords: pcmodel; pcmtest; partial credit model; rating scale model; item response theory; fit tests (search for similar items in EconPapers)
Date: 2016
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