Summary
Contents
Subject index
Polytomous Item Response Theory Models provides a unified, comprehensive introduction to the range of polytomous models available within item response theory (IRT). It begins by outlining the primary structural distinction between the two major types of polytomous IRT models. This focuses on the two types of response probability that are unique to polytomous models and their associated response functions, which are modeled differently by the different types of IRT model. It describes, both conceptually and mathematically, the major specific polytomous models, including the Nominal Response Model, the Partial Credit Model, the Rating Scale model, and the Graded Response Model.
Model Selection
Model Selection
The models described above were each introduced by their developers with a particular rationale in mind. Generally, little empirical evidence has been tendered to substantiate the rationales for each model, and, in the case of the PCM, the original rationale for its development had been demonstrated to ...
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