libirt
    
            
                
                    The new site is at http://psychometricon.net/libirt/
                
            
             
            
             
            
        
            The new site is at http://psychometricon.net/libirt/
Library of functions to estimate the items and abilities from the responses of subjects to a questionnaire. The IRT models supported are the logistic model, the multivariate logistic model, the graded model and smoothing by penalization and kernel.