A set of functions to perform Raju, van der Linden and Fleer's (1995, doi:10.1177/014662169501900405) Differential Functioning of Items and Tests (DFIT) analyses. It includes functions to use the Monte Carlo Item Parameter Replication approach (Oshima, Raju, & Nanda, 2006, doi:10.1111/j. 1745-3984.2006.00001.x) for obtaining the associated statistical significance tests cut-off points. They may also be used for a priori and post-hoc power calculations (Cervantes, 2017, doi:10.18637/jss.v076.i05).
added functionality to CutoffIpr so that it may calculate the asymptotic variance-covariance matrices without
providing them. Also added parameter nullGroup to specify which item parameters should be considered for the item
replicates when calculated by the function.
added logistic parameter to DeltaMhIrt function
removed use of not exported functions in the demos