Parameters Estimation of IRT Multicategory Scoring Item

The target of the paper is to solve the parameters estimate problem of IRT multicategory scoring item. The main achievement of the paper as follow: 1) Gave a parameters estimate method of IRT multicategory scoring item; 2) Proved the probability convergence of the method; 3) Edited tile program of parameters estimation and discussed the applications by a example; 4) The extension of the method.