IRT Scale Transformation Programs
The computer programs listed below can be used to conduct various IRT scale transformations. Windows PC console and graphical user interface (GUI) versions and Macintosh OS9 console and OS10 GUI versions are available for at least some of the programs. The programs can be downloaded below.
ST
Conducts item response theory (IRT) scale transformations for dichotomously scored tests.
POLYST
Conducts IRT scale transformations for dichotomously and polytomously scored tests.
STURT
Conduct IRT scale transformations for mixed-format tests.