项目反应理论下Likert型量表的DIF检测方法初探

Research on Defection of DIF in Likert-type Scales under IRT

该研究以SCL-90量表中的“恐怖”因子为例,采用Samejima等级反应模型(Graded Response Model)对该因子进行项目功能差异检测,以探讨项目反应理论下Likert型量表的DIF检测方法.研究发现,对于Likert型量表在项目反应理论框架下可采用等值化的方法进行DIF检测.

Using Samejima＇s Graded Response Model, this paper discussed the defection of DIF in Likert-type scales. By research on SCL-90 scale, this paper drew some conclusions on the way and the application of defection of DIF in Likert-type scales under IRT. It shows that we can use equality method to defect DIF under IRT.