An implementation of the generalized graded unfolding model (GGUM) in R, see Roberts, Donoghue, and Laughlin (2000) <doi:10.1177/01466216000241001>). It allows to simulate data sets based on the GGUM. It fits the GGUM and the GUM, and it retrieves item and person parameter estimates. Several plotting functions are available (item and test information functions; item and test characteristic curves; item category response curves). Additionally, there are some functions that facilitate the communication between R and 'GGUM2004'. Finally, a modelfit checking utility, MODFIT(), is also available.
Package details 


Author  Jorge N. Tendeiro [aut, cre], Sebastian CastroAlvarez [aut] 
Maintainer  Jorge N. Tendeiro <j.n.tendeiro@rug.nl> 
License  GPL (>= 2) 
Version  0.4 
URL  http://github.com/jorgetendeiro/GGUM 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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