Conversion of IRT Item Response Models

Abstract

When we construct an item bank, it is important to choose item response models carefully. However, due to various reasons, we may have to convert the item response models from one model to another. Furthermore, when we wish to compare several item response models, it is helpful if we can find a model which best matches the item characteristics of another. In this article, we developed a method to convert an item response model to another, implemented the method as an R package, and showed some numerical examples using both artificial and real data sets.