BILOG-MG is a software program for the development, analysis, scoring, and maintenance of educational and other measurement instruments within the statistical framework of item response theory (IRT). As a tool for applying IRT to practical testing problems, the program is concerned with estimating the characteristics of the items in an instrument (the item parameters) and the standing or position of respondents on the underlying attribute or latent trait the items are intended to measure (the person parameters or scale scores). The program is specifically designed for the analysis of item responses classified into two categories (i.e., dichotomously scored or binary items) and offers a wide range of options for fitting IRT models to item response data of that type. This entry describes the program’s ...

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