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A local-influence-based diagnostic approach to a speeded item response theory model

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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.

Keywords: Item response theory; Local influence; Missing data; ‘Test speededness’

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1467-9876.2006.00558.x

Affiliations: 1: Katholieke Universiteit Leuven, Belgium, and University of Southern Denmark, Odense, Denmark 2: Katholieke Universiteit Leuven, Belgium 3: Hasselt University, Diepenbeek, Belgium 4: Pontificia Universidad Católica de Chile, Santiago, Chile

Publication date: November 1, 2006

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