计算机自适应测试系统的模型研究

摘要

This paper expatiates on two main theories of instructional test,including classical test theory（CTT） and item response theory（IRT）.IRT is the theoretical basis of computer adaptive test（CAT）,which has the superiority over CTT.Here expounds the characteristics of IRT,several IRT models,and the basic theory of logistic model with a representation of three parameter logistic model.%本文阐述了教育测量的两种主要理论,即经典测试理论（Classical Test Theory,CTT）和项目反应理论（Item Response Theory,IRT）,其中IRT是计算机自适应测试CAT的理论基础。介绍了IRT和CTT相比的优点和几种IRT模型,并以三参数Logistic模型为代表论述了Logistic模型的基本理论。