Application of a method of estimating DIF for polytomous test items

被引:29
作者
Camilli, G [1 ]
Congdon, P
机构
[1] Rutgers State Univ, Grad Sch Educ, Dept Educ Psychol, Piscataway, NJ 08855 USA
[2] Australian Council Educ Res, Measurement Div, Melbourne, Vic, Australia
关键词
DIF; DIF variance; differential item functioning; differential test functioning; DTF; graded response model; item response theory; polytomous items;
D O I
10.3102/10769986024004323
中图分类号
G40 [教育学];
学科分类号
040101 ; 120403 ;
摘要
In this paper; a method for studying DIF is demonstrated that can used with either dichotomous or polytomous items. The method is shown to be valid for data that follow a partial credit IRT model. It is also shown that logistic regression gives results equivalent to those of the proposed method. In a simulation study, positively biased type I error rates of the method are shown to be in accord with results from previous studies; however; the size of the bias in the log odds is moderate. Finally, it is demonstrated how these statistics can be used to study DIF variability with the method of Longford, Holland, & Thayer (1993).
引用
收藏
页码:323 / 341
页数:19
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