In ltm (version 0.8-1) you may also check the following functions: descript(), cronbach.alpha(), mult.choice()
I hope it helps. Best, Dimitris ps, you may find more information about `ltm' as well as sample analysis files at the Rwiki page: http://wiki.r-project.org/rwiki/doku.php?id=packages:cran:ltm ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "Doug Holton" <[EMAIL PROTECTED]> To: <r-help@r-project.org> Sent: Wednesday, September 19, 2007 2:36 AM Subject: [R] recommended package/docs for analyzing multiple choice tests > Hi, > What package would you recommend for analyzing the > validity/reliability of multiple choice tests. Doing things such as > classical test analysis, factor analysis, item response theory. > > I've used psychometric (item.exam), MiscPsycho (alpha.Summary), and > ltm > (rcor.test). MiscPsycho reported the numbers most similar to what I > get > in SPSS: corrected point biserial correlations, cronbach's alpha. I > didn't understand what the psychometric package meant by its > "discrimination" and "item reliability" numbers output by the > item.exam > function. Perhaps the former is uncorrected point biserial > correlations? They were higher values. I downloaded and inspected > the source code for both packages. It was hard to understand what > the > functions were doing without some comments in the code. > > Also, would you recommend a book or resource with examples of using > R > for test analysis. > > Thank you, it's been great learning R, > -Doug > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.