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.
