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Sideridis, Georgios D. – Educational and Psychological Measurement, 2016
The purpose of the present studies was to test the hypothesis that the psychometric characteristics of ability scales may be significantly distorted if one accounts for emotional factors during test taking. Specifically, the present studies evaluate the effects of anxiety and motivation on the item difficulties of the Rasch model. In Study 1, the…
Descriptors: Learning Disabilities, Test Validity, Measures (Individuals), Hierarchical Linear Modeling
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Hartig, Johannes; Frey, Andreas; Nold, Gunter; Klieme, Eckhard – Educational and Psychological Measurement, 2012
The article compares three different methods to estimate effects of task characteristics and to use these estimates for model-based proficiency scaling: prediction of item difficulties from the Rasch model, the linear logistic test model (LLTM), and an LLTM including random item effects (LLTM+e). The methods are applied to empirical data from a…
Descriptors: Item Response Theory, Models, Methods, Computation