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
Ability estimates for partial credit model
2 messages · Andrej Kastrin, Doran, Harold
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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