基于项目反应理论调试性英语测试a值调整

Adjustment of a Value for Debugging English Test Based on Item Response Theory

区分度a值是衡量考试题目质量最重要的参数。在电脑调试性英语测试中,造成题库建设难度过大的主要原因在于题目区分度a值的界定线异常模糊,题目区分度a值很难被确定。传统的人工界定法极其耗时,甚至不能完成。利用极大似然法,建立区分度a值精确的数学模型,编写计算机程序解该a值模型,完成对a值快速而准确的调整。

The distinction degree a value is the most important parameter that assesses the quality of examination questions.In computer English adaptive test,it＇s difficult to construct a database.The main reason is that the definition of a value line is abnormally fuzzy,and the a value is difficult to be sure.The traditional artificially definition method is very time-consuming,Can＇t even finish.An accurate mathematical model for the distinction degree a value was established with the maximum likelihood method.A calculator procedure was compiled to solve the model of a value.The quick and accurate adjustment for a value was implemented.