Behaviormetrika
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BAYESIAN IRT MODELS INCORPORATING GENERAL AND SPECIFIC ABILITIES
Yanyan ShengChristopher K. Wikle
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Volume 36 (2009) Issue 1 Pages 27-48

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Abstract

IRT-based models with a general ability and several specific ability dimensions are useful. Studies have looked at item response models where the general and specific ability dimensions form a hierarchical structure. It is also possible that the general and specific abilities directly underlie all test items. A multidimensional IRT model with such an additive structure is proposed under the Bayesian framework. Simulation studies were conducted to evaluate parameter recovery as well as model comparisons. A real data example is also provided. The results suggest that the proposed additive model offers a better way to represent the test situations not realized in existing models.

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© 2009 by The Behaviormetric Society of Japan
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