DFIT 1.0-1 ========== * 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 DFIT 1.0-2 ========== * fixed CITATION DFIT 1.0-3 ========== * fixed citation to Raju, van der Linden & Fleer's 1995 paper. * now imports stats functions that resulted in no visible bindings in more recent versions of R. * added citation to JSS paper.