A local-influence-based diagnostic approach to a speeded item response theory model |
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Authors: | Yuri Goegebeur Paul De Boeck Geert Molenberghs Guido del Pino |
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Institution: | Katholieke Universiteit Leuven, Belgium, and University of Southern Denmark, Odense, Denmark; Katholieke Universiteit Leuven, Belgium; Hasselt University, Diepenbeek, Belgium; Pontificia Universidad Católica de Chile, Santiago, Chile |
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Abstract: | Summary. An item response theory model for dealing with omitted responses in a test is proposed. In this model formulation, non-response does not only depend on an examinee's ability and on item difficulty, but additionally also on 'test speededness'. Using a local-influence-based diagnostic approach, the sensitivity of the model regarding assumptions concerning the drop-out mechanism is explored. The methodology proposed is applied to the Chilean Sistema de Medición de la Calidad de la Educación mathematics test case-study. |
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Keywords: | Item response theory Local influence Missing data 'Test speededness' |
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