Item response theory IRT is a psychometric approach which assumes that the probability of a certain response is a direct function of an underlying trait or traits. Various functions have been proposed to model this relationship, and the different calibration packages reflect this. Several software packages have been developed for additional analysis such as equating; they are listed in the next section.
ICL
ICL IRT Command Language performs IRT calibrations, including the 1, 2, and 3 parameter logistic models as well as the partial credit model and generalized partial credit model. It can also generate response data. As the name implies, it is completely command code driven, with no graphical user interface. It is available for free download here .
PARAM-3PL
PARAM-3PL external link is a free program for the calibration of the 3-parameter logistic IRT model. It was developed by Lawrence Rudner at the Education Resources Information Center ERIC. The latest release was version 0.89 in June 2007. It is available from ERIC here .
XCalibre
XCalibre
XCalibre is a commercial program that performs marginal maximum likelihood estimation of both dichotomous 1PL-Rasch, 2PL, 3PL and polytomous IRT models, utilizing text files for both input and output. The interface is point-and-click; no command code required. It is only available from Assessment Systems Corporation external link .
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