ltm

Author: Dimitris Rizopoulos
Contact: https://github.com/drizopoulos/ltm
Description: Analysis of multivariate dichotomous and polytomous data using latent trait models under the Item Response Theory approach. It includes the Rasch, the Two-Parameter Logistic, the Birnbaum's Three-Parameter, the Graded Response, and the Generalized Partial Credit Models.
Analyses: Item & Test Analysis
System Requirements: Windows, Mac OS, & Linux
Measurement Model: IRT/Rasch
License Type: Open-Source
Documentation: user manual, sample data