认知元反应理论--IRT直接应用于多值记分题

0-1记分测验的项目反应理论已经得到广泛的研究和应用.但是,许多测验都含有多值记分题,所以需要将IRT推广到此类情况.从认知理论的观点看,每个0-1记分题(项目)和多值记分题的每个测试点都可同样地看成一个由若干知识点构成的集合,称之为认知元;根据认知元之间存在的关系可以确定各受测者对各试题作出特定答案的概率,从而不需要引用任何其它假设就可将IRT的方法直接应用于含多值记分题的测验.本文应用这一理论分析了某些测验样本,结果表明是可行的.

Cognition Element Response Theory-Using IRT in Polychotomously Scored Items Directly

The item response theory (IRT) for dichotomously scored tests has been studied and used extensively However, many tests employed polychotomously scored items So it is necessary that IRT be extended to such tests From the view point of cognition, any dichotomously scored item is a collection of knowledge, so is any test point of polychotomously scored items, which may be called a Cognition Element (CE). According to the relation among CEs, it is not difficult to find the probability of the whole test sample The IRT can be used in polychotomously scored items directly without any other hypothesis We could estimate the parameters of the CEs and the ability parameters of the examinee by maximum likelihood We have utilized this method to analyze several tests and found it works well