Yes, see the irt.ability function in the MiscPsycho package. This has methods for maximum likelihood, and the two common bayesian estimates (MAP, EAP). I am right now writing code for test characteristic methods.
> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Andrej Kastrin > Sent: Thursday, September 18, 2008 8:15 AM > To: r-help > Subject: [R] Ability estimates for partial credit model > > Dear all, > > I'm working on ability estimates using Rasch model. Using the "ltm" > package, the procedure is quite simple: > > ## Factor Scores for the Rasch model > fit <- rasch(LSAT) > factor.scores(fit) > > What about Partial Credit Model (PCM)? For PCM I use PCM > function from eRm package. Is there any similar function like > factor.scores to estimate ability scores using PCM model? > > Best, Andrej > > ______________________________________________ > 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. > ______________________________________________ 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.
