hi, i've been planning this for a long time, now i have finally started working on a plugin for data analysis unter the item response theory approach :-)
i've implemented parameter estimation for dichotomous data last night, to fit the rasch, two parameter logistic and birnbaum three parameter model. the plugin relies on the ltm package: o http://wiki.r-project.org/rwiki/doku.php?id=packages:cran:ltm almost all options of the rasch(), ltm() and tpm() functions are available, only the "parscale" control of tpm() and the two factor model of ltm() are missing, as of now. my future plans are to develop additional dialogs for goodness-of-fit tests and ltm specific plot options (e.g. test information curves). but of course any suggestions are wellcome :-) here's the plugin: o http://reaktanz.de/stuff/R/irt_plugin-0.01.tar.bz2 and some screenshots: o http://reaktanz.de/stuff/R/scrsht3_01_data_model.png o http://reaktanz.de/stuff/R/scrsht3_02_options.png o http://reaktanz.de/stuff/R/scrsht3_03_advanced_control.png there's also a quick&dirty wizard, but i'm not sure if it's really useful... since the plugin needs the ltm package, i've included a simple library(ltm) call in the preprocess function. is there a better way to make sure it's loaded, except doing it manually? viele gruesse :: m.eik -- dipl. psych. meik michalke institut f"ur experimentelle psychologie abt. f"ur diagnostik und differentielle psychologie heinrich-heine-universit"at
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