MCMC GGUM

Author: Wei Wang, Jimmy de la Torre, & Fritz Drasgow
Contact: computationalpsychology.org/resources/
Description: The MCMC GGUM computer program employs the Metropolis-Within-Gibbs algorithm (Hastings, 1970; Metropolis, Rosenbluth, Rosenbluth, Teller, & Teller, 1953) and estimates the item and person parameters simultaneously. This program is capable of calibrating data sets with up to 10 response categories, and, theoretically, with no limit on the number of items and respondents. This program can also handle missing values in the data. In addition, the MCMC GGUM computer program allows users to adjust the distributions of priors, which is an important feature that is not supported in GGUM2004.
Analyses: Equating; Scaling
System Requirements: Windows
Measurement Model: IRT/Rasch
License Type: Freeware
Documentation: user manual, sample data and syntax