IRT-Lab

Return to Directory

Author: Randall D. Penfield
Contact: http://soe.uncg.edu/academics/departments/erm/erm-software/
Description: IRT-Lab is a program intended to be used in teaching and understanding IRT concepts. The program allows the user to view the item characteristic curves for specified parameterizations of numerous IRT and Rasch models (dichotomous and polytomous), as well as view the associated item and test information functions, and likelihood functions associated with maximum likelihood estimation of ability and item parameter estimation. In addition, IRT-Lab can generate simulated responses to a specified group of items.
Analyses: DIF; Dimensionality; Equating; Latent Class Models; Multidimensional Models; Multilevel Data; Simulation/Resampling
System Requirements: Windows
Measurement Model: IRT/Rasch
License Type: Freeware
Documentation: A manual in PDF format is available free of charge

Software License
Freeware
Measurement Model
Item Response Theory; Rasch
Analysis
Differential Item Functioning; Dimensionality; Equating; Latent Class Models; Multidimensional Models; Multilevel Data; Simulation/Resampling