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Nandakumar, Ratna – 1995
A modification of the SIBTEST procedure to assess differential item functioning (DIF) for two-dimensional test data (i.e., data for tests where two intended abilities are tapped by test items) is described. A small simulation study is carried out to assess the performance of the modified SIBTEST to detect DIF in such two-dimensional data. The…
Descriptors: Ability, Identification, Item Bias, Power (Statistics)
Download full textNandakumar, Ratna; Roussos, Louis – 2001
Computerized adaptive tests (CATs) pose major obstacles to the traditional assessment of differential item functioning (DIF). This paper proposes a modification of the SIBTEST DIF procedure for CATs, called CATSIB. CATSIB matches test takers on estimated ability based on unidimensional item response theory. To control for impact-induced Type I…
Descriptors: Ability, Adaptive Testing, Computer Assisted Testing, Identification
