ABSTRACT
Item response theory (IRT) can be used to analyze a test and to perform an item analysis. In Section 10.2, item analysis with IRT will be discussed. There is more to IRT. The development of IRT has opened new ways for test applications and research with tests. This is true especially for the parametric IRT models. Nonparametric models may be less restrictive than parametric models, but they are also less informative.
