Detecting differential item functioning across age groups of children on the Turkish receptive language test

Date

2012-01-01

Author

Erol Korkmaz, Habibe Tuğba
Stark, Stephan
Kazak Berument, Sibel
Güven, Ayşe Gül

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This study investigated the use of differential item functioning (DIF) methods for examining the measurement invariance of items in the Turkish Receptive Language Test for children. Two groups of children differing in age were compared. DIF analyses were conducted using Lord’s chi-square test, the likelihood ratio test, and the differential functioning of items and tests (DFIT) method. Overall, 5 out of 38 items were consistently identified as having DIF by the various parametric DIF detection methods. Because the directions of DIF varied across items, the net effect of DIF at the scale level was small, as indicated by comparisons of test characteristic curves, as well as item response theory based effect size statistics, which showed that the observed mean differences across age groups were due mainly to impact. Potential explanations for the consistencies and variations in items detected across DIF methods, as well statistical versus practical significance of DIF results are discussed.

Subject Keywords

Differential item functioning, Measurement bias, Item response theory, Turkish Receptive Language Test, Receptive vocabulary test for children

URI

https://hdl.handle.net/11511/75846

Journal

International Journal of Educational and Psychological Measurement

Collections

Department of Psychology, Article

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Citation Formats

H. T. Erol Korkmaz, S. Stark, S. Kazak Berument, and A. G. Güven, “Detecting differential item functioning across age groups of children on the Turkish receptive language test,” International Journal of Educational and Psychological Measurement, pp. 81–94, 2012, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/75846.