The IRT Procedure

Basic Features

The IRT procedure enables you to estimate various item response theory models. The following list summarizes some of the basic features of the IRT procedure:

  • uses the Rasch model; one-, two-, three-, and four-parameter models; and graded response model with logistic or probit link

  • enables different items to have different response models

  • performs multidimensional exploratory and confirmatory analysis

  • performs multiple-group analysis, with fixed values and equality constraints within and between groups

  • estimates factor scores by using maximum likelihood (ML), maximum a posteriori (MAP), and expected a posteriori (EAP) methods