flexMIRT Version 2.0: Flexible multilevel item analysis and test scoring. A multilevel, multidimensional, and multiple group item response theory (IRT) software package for item analysis and test scoring. flexMIRT® fits a variety of unidimensional and multidimensional item response theory models (also known as item factor analysis models) to single-level and multilevel data in any number of groups
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References in zbMATH (referenced in 1 article )
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- Cai, Li: Lord-Wingersky algorithm version 2.0 for hierarchical item factor models with applications in test scoring, scale alignment, and model fit testing (2015)