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Kim, Seock-Ho; Cohen, Allan S. – Applied Psychological Measurement, 1991
The exact and closed-interval area measures for detecting differential item functioning are compared for actual data from 1,000 African-American and 1,000 white college students taking a vocabulary test with items intentionally constructed to favor 1 set of examinees. No real differences in detection of biased items were found. (SLD)
Descriptors: Black Students, College Students, Comparative Testing, Equations (Mathematics)
Peer reviewed Peer reviewed
Cohen, Allan S.; Kim, Seock-Ho – Applied Psychological Measurement, 1993
The effectiveness of two statistical tests of the area between item response functions (exact signed area and exact unsigned area) estimated in different samples, a measure of differential item functioning (DIF), was compared with Lord's chi square. Lord's chi square was found the most effective in determining DIF. (SLD)
Descriptors: Chi Square, Comparative Analysis, Equations (Mathematics), Estimation (Mathematics)
Peer reviewed Peer reviewed
Kim, Seock-Ho; Cohen, Allan S. – Journal of Educational Measurement, 1992
Effects of the following methods for linking metrics on detection of differential item functioning (DIF) were compared: (1) test characteristic curve method (TCC); (2) weighted mean and sigma method; and (3) minimum chi-square method. With large samples, results were essentially the same. With small samples, TCC was most accurate. (SLD)
Descriptors: Chi Square, Comparative Analysis, Equations (Mathematics), Estimation (Mathematics)
Kim, Seock-Ho; And Others – 1993
Detection of differential item functioning (DIF) is most often done between two groups of examinees under item response theory. It is sometimes important, however, to determine whether DIF is present in more than two groups. A method is presented for the detection of DIF in multiple groups. The method, the Q(sub j) statistic, is closely related to…
Descriptors: Chi Square, College Students, Comparative Analysis, Equations (Mathematics)
Kim, Seock-Ho; Cohen, Allan S. – 1991
Studies of differential item functioning (DIF) under item response theory require that item parameter estimates be placed on the same metric before comparisons can be made. Evidence that methods for linking metrics may be influenced by the presence of differentially functioning items has been inconsistent. The effects of three methods for linking…
Descriptors: Chi Square, Comparative Analysis, Equations (Mathematics), Estimation (Mathematics)