Latent Class Item Response Theory (LC-IRT) Models under Within-Item Multidimensionality

Framework for the Item Response Theory analysis of dichotomous and ordinal polytomous outcomes under the assumption of within-item multidimensionality and discreteness of the latent traits. The fitting algorithms allow for missing responses and for different item parametrizations and are based on the Expectation-Maximization paradigm. Individual covariates affecting the class weights may be included in the new version together with possibility of constraints on all model parameters.


Reference manual

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2.1.1 by Francesco Bartolucci, 2 years ago

Browse source code at

Authors: Francesco Bartolucci , Silvia Bacci - University of Perugia (IT)

Documentation:   PDF Manual  

Task views: Psychometric Models and Methods

GPL (>= 2) license

Depends on MASS, limSolve, MultiLCIRT

Suggested by dextergui.

See at CRAN