[R] Ability estimates for partial credit model

Doran, Harold HDoran at air.org
Thu Sep 18 22:18:56 CEST 2008

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: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] 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
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