多级评分CAT的认知诊断方法

The Method of Cognitive Diagnosis CAT Based on Polytomous Scoring Model

认知诊断因其能识别被试认知状态已成为CAT研究的重要部分之一,但目前研究大多都基于0-1评分,这与我国试题也采用多级评分现状不相适应.因此,研究基于多级评分的认知诊断具有重要意义.该文主要研究开发多级评分模型下有认知诊断功能的CAT测试系统,采用等级反应模型(GRM),使用先认知诊断后估计能力的方法.该系统的认知诊断正确率较高,且诊断结果较稳定,能力估计也较准确,测验安全性好.

Recently, the cognitive diagnosis which can effectively diagnose students＇ knowledge states has become one of important parts of research on CAT,but most of the researches are based on dichotomous scoring model, the extent of which is not applied extensively. So research in the cognitive diagnosis under polytomous scoring model is very meaningful. Cognitive diagnosis CAT based on Polytomous Scoring Model has been researched and developed in this paper, the examinee＇ s ability has been estimated after carrying out cognitive diagnosis under the Samejima Graded Response Model. The results of this design indicate that accuracy of the CAT＇ s diagnosis is comparative higher and steadier, the ability of evaluation was also more accurate and safer.