mdltm GDM

Author: Matthias von Davier
Contact: http://www.von-davier.com/
Description: A graphical user interface and estimation algorithm for the general diagnostic model. Research license (contact author for details and to obtain a license agreement). The software provides marginal maximum likelihood estimates obtained using customary EM methods. This software is suitable for data from large-scale assessment programs like PISA, NAEP, IALS, or TIMSS. Estimates can be obtained for a variety of models: IRT , multivariate IRT, latent class, diagnostic, mixture distribution, multidimensional mixture IRT, mixture diagnostic, multiple group, and growth mixture models. mdltm can handle the following data types: dichotomous / polytomous response data, matrix samples (data missing by design and at random), weighted data, and grouped data (multiple-population multiple-group IRT models and non-parametric hierarchical LCA and mixture IRT).
Analyses: Dimensionality; Factor/Latent Structure
System Requirements: Windows (GUI and estimation core software) Linux or Mac OSX
Measurement Model: IRT/Rasch
License Type: Freeware
Documentation: Draft manual, examples