Effects of Differential Item Functioning on Examinees' Test Performance and Reliability of Test

Autor/inn/en	Lee, Yi-Hsuan; Zhang, Jinming
Titel	Effects of Differential Item Functioning on Examinees' Test Performance and Reliability of Test
Quelle	In: International Journal of Testing, 17 (2017) 1, S.23-54 (32 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1530-5058
DOI	10.1080/15305058.2016.1224888
Schlagwörter	Test Bias; Test Reliability; Performance; Scores; Item Response Theory; Computation; True Scores; Error of Measurement; Test Length; Test Items; Sample Size; Differences + Suchen Sie Ihr Suchwort? Testkritik; Testreliabilität; Achievement; Leistung; Item-Response-Theorie; Messfehler; Test content; Testaufgabe; Unterscheiden
Abstract	Simulations were conducted to examine the effect of differential item functioning (DIF) on measurement consequences such as total scores, item response theory (IRT) ability estimates, and test reliability in terms of the ratio of true-score variance to observed-score variance and the standard error of estimation for the IRT ability parameter. The objective was to provide bounds of the likely DIF effects on these measurement consequences. Five factors were manipulated: test length, percentage of DIF items per form, item type, sample size, and level of group ability difference. Results indicate that the greatest DIF effect was less than 2 points on the 0 to 60 total score scale and about 0.15 on the IRT ability scale. DIF had a limited effect on the ratio of true-score variance to observed-score variance, but its influence on the standard error of estimation for the IRT ability parameter was evident for certain ability values. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01