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  1. No Access

    Chapter

    Robustness of IRT Observed-Score Equating

    One of the most important aspects of equating, scaling, and linking is whether the models used are appropriate. In this chapter, some heuristic methods and a more formal model test for the evaluation of the ro...

    C. A. W. Glas… in Statistical Models for Test Equating, Scaling, and Linking (2011)

  2. No Access

    Article

    A Person Fit Test For Irt Models For Polytomous Items

    A person fit test based on the Lagrange multiplier test is presented for three item response theory models for polytomous items: the generalized partial credit model, the sequential model, and the graded respo...

    C. A. W. Glas, Anna Villa T. Dagohoy in Psychometrika (2007)

  3. No Access

    Article

    Development of the Qualeffo–31, an osteoporosis-specific quality-of-life questionnaire

    Vertebral deformities are a common consequence of osteoporosis and are known to decrease quality of life. The Qualeffo–41 is a quality-of-life questionnaire especially developed for measuring quality of life i...

    N. M. van Schoor, D. L. Knol, C. A. W. Glas… in Osteoporosis International (2006)

  4. No Access

    Article

    Checking the Assumptions of Rasch's Model for Speed Tests

    Two new tests for a model for the response times on pure speed tests by Rasch (1960) are proposed. The model is based on the assumption that the test response times are approximately gamma distributed, with kn...

    M. G. H. Jansen, C. A. W. Glas in Psychometrika (2005)

  5. No Access

    Article

    MCMC estimation and some model-fit analysis of multidimensional IRT models

    A Bayesian procedure to estimate the three-parameter normal ogive model and a generalization of the procedure to a model with multidimensional ability parameters are presented. The procedure is a generalizatio...

    A. A. Béguin, C. A. W. Glas in Psychometrika (2001)

  6. No Access

    Chapter

    A Steps Model to Analyze Partial Credit

    The partial credit model (PCM) by Masters (1982, this volume) is a unidimensional item response model for analyzing responses scored in two or more ordered categories. The model has some very desirable propert...

    N. D. Verhelst, C. A. W. Glas, H. H. de Vries in Handbook of Modern Item Response Theory (1997)

  7. No Access

    Article

    A dynamic generalization of the Rasch model

    In the present paper a model for describing dynamic processes is constructed by combining the common Rasch model with the concept of structurally incomplete designs. This is accomplished by map** each item o...

    N. D. Verhelst, C. A. W. Glas in Psychometrika (1993)

  8. No Access

    Article

    Extensions of the partial credit model

    The partial credit model, developed by Masters (1982), is a unidimensional latent trait model for responses scored in two or more ordered categories. In the present paper some extensions of the model are prese...

    C. A. W. Glas, N. D. Verhelst in Psychometrika (1989)