It is very important for designing item pool optimal Q-matrix for nonparametric CD-CAT which can guide the item writing without the need of model parameter estimation.Inspired by p-optimal design,a proportional method is proposed for designing optimal Q-matrix,and an existing parametric method is extended to nonparametric CD-CAT,called the fusion method.Simulation results show that two methods have similar performance,while the propor-tional method has certain advantages when the number of items is small.
维普
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