I have just submitted irtoys_0.1.0, a package potentially useful for
those working with IRT models. It can fit the 1PL, 2PL, and 3PL models
through a simple and unified syntax, using either the R package ltm,
Brad Hanson's ICL program, or the commercially available BILOG-MG. The
purpose is basically to facilitate teaching, and especially comparisons
across models and/or programs. Various graphs, item fit statistics,
scaling methods, ability estimation, simulation facilities etc. are also
included. Please notice that most options in estimating an IRT model are
kept to the typical default values, and only a small, common subset of
the ltm, ICL, and BILOG syntax is supported. Comments are very welcome.
Ivailo Partchev
Institute of Psychology
University of Jena
Germany
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