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Identifying Nonuniform DIF in Polytomously Scored Test Items. ACT Research Report Series 94-1.

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Bibliographic Details
Title:	Identifying Nonuniform DIF in Polytomously Scored Test Items. ACT Research Report Series 94-1.
Language:	English
Authors:	Spray, Judith, Miller, Tim, American Coll. Testing Program, Iowa City, IA.
Availability:	ACT Research Report Series, P.O. Box 168, Iowa City, IA 52243.
Peer Reviewed:	N
Page Count:	21
Publication Date:	1994
Document Type:	Reports - Research
Descriptors:	Computer Simulation, Identification, Item Bias, Sample Size, Scoring, Statistical Analysis, Test Items
Abstract:	Computer simulations under three conditions of polytomous differential item functioning (DIF) compared the ability of three different statistical procedures to detect nonuniform DIF. The procedures were a nominal and an ordinal extension of the Mantel-Haenszel statistic, and logistic discriminant function analysis. Results showed that only the logistic discriminant function analysis could detect all types of nonuniform DIF simulated when sample sizes were moderate to large (i.e., N > 500). This procedure is recommended when nonuniform DIF identification is required. Contains 2 tables, 3 figures, and 10 references. (Author/SLD)
Entry Date:	1995
Accession Number:	ED376216
Database:	ERIC

Description
Abstract:	Computer simulations under three conditions of polytomous differential item functioning (DIF) compared the ability of three different statistical procedures to detect nonuniform DIF. The procedures were a nominal and an ordinal extension of the Mantel-Haenszel statistic, and logistic discriminant function analysis. Results showed that only the logistic discriminant function analysis could detect all types of nonuniform DIF simulated when sample sizes were moderate to large (i.e., N > 500). This procedure is recommended when nonuniform DIF identification is required. Contains 2 tables, 3 figures, and 10 references. (Author/SLD)