IRTEQ

Author: Kyung (Chris) T. Han
Contact: http://www.hantest.net/irteq
Description: IRTEQ is a freeware Windows GUI application that implements IRT scaling and equating developed by Kyung (Chris) T. Han. It implements IRT scaling/equating methods that are widely used with an anchor test design (the “Non-Equivalent Groups Anchor Test”): Mean/Mean, Mean/Sigma, Robust Mean/Sigma, and TCC methods. For TCC methods, IRTEQ provides the user with the option to choose various score distributions for incorporation into the loss function. IRTEQ supports various popular unidimensional IRT models: Logistic models for dichotomous responses (with 1, 2, or 3 parameters) and the Generalized Partial Credit Model (GPCM) (including Partial Credit Model (PCM), which is a special case of GPCM) and Graded Response Model (GRM) for polytomous responses. IRTEQ can also equate test scores on the scale of a test to the scale of another test using IRT true score equating.
Analyses: Equating; Multidimensional Models
System Requirements: Windows
Measurement Model: IRT/Rasch
License Type: Freeware
Documentation: user's manual and example data