GGUM

Author: Jorge N. Tendeiro, Sebastian Castro-Alvarez
Contact: https://cran.r-project.org/web/packages/GGUM/index.html
Description: GGUM: Generalized Graded Unfolding Model. 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 model-fit checking utility, MODFIT(), is also available.
Analyses: Attitude Scaling; Equating; Scaling
System Requirements: Windows, Mac, Linux
Measurement Model: IRT/Rasch
License Type: Open-Source (R)
Documentation: user manual

Software License
Open-Source (R)
Measurement Model
Item Response Theory, Rasch
Analysis
Attitude Scaling, Equating, Scaling