[R] [R-pkgs] irtoys

From: Ivailo Partchev <Ivailo.Partchev_at_uni-jena.de>
Date: Tue, 08 May 2007 12:52:25 +0200


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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