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.
Recommended Citation
Sheng, Yanyan and Wikle, Christopher K. "Bayesian IRT Models Incorporating General and Specific Abilities." (Apr 2009).
Comments
Published in Behaviormetrika, Vol. 36 No. 1 (2009) at doi:10.2333/bhmk.36.27