计算机自适应测验中测验安全控制方法评述

Test Security Methods in Computerized Adaptive Testing

计算机自适应测验在实际应用中曾经受到了测验安全问题质疑。国内外学者主要从两种研究思路提出了测验安全控制的方法:一是控制项目的最大曝光率,沿着这个思路发展出来的方法有SH法、项目合格方法、多重最大曝光率法等;二是改进选题策略,沿着这个思路发展的方法主要是a分层法及其变式。此外,近年来出现了测验安全控制方法之间相结合的研究思路。本文从均方误差、项目曝光率、题库利用率等指标论述了测验安全控制方法的优缺点,并概述了这些测验安全控制方法的研究发展历程与发展思路,展望了今后的研究趋势。

Computerized adaptive testing has been subject to security problem in practice.To solve the problem,the researchers at home and abroad have done a lot mainly in two ways.One is to impose a maximum exposure rate of items in the bank that no item could exceed,which includes SH method,item eligibility method,multiple maximum exposure rate method and so on.The other is to improve item selection strategy,which involves a-stratification method and its alternations.Furthermore,the two solutions have been integrated in recent years.In this article,the author will discuss the advantages and disadvantages of these methods focusing on MSE and bias,test overlap rate,utilization rate of item bank and so on.Finally,development history and research ways of the test security method are summarized,and future research trends are forecast as well.