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ERIC Number: EJ855727
Record Type: Journal
Publication Date: 2009
Pages: 16
Abstractor: As Provided
Reference Count: 40
ISSN: ISSN-1062-7197
Using DDF in a Post Hoc Analysis to Understand Sources of DIF
Banks, Kathleen
Educational Assessment, v14 n2 p103-118 2009
The purpose of this article is to describe and demonstrate a three-step process of using differential distractor functioning (DDF) in a post hoc analysis to understand sources of differential item functioning (DIF) in multiple-choice testing. The process is demonstrated on two multiple-choice tests that used complex alternatives (e.g., "No Mistakes") as distractors. Comparisons were made between different gender and race groups. DIF analyses were conducted using Simultaneous Item Bias Test, whereas DDF analyses were conducted using loglinear model fitting and odds ratios. Five items made it through all three steps and were identified as those with DIF results related to DDF. Implications of the results, as well as suggestions for future research, are discussed. (Contains 3 tables, 1 figure and 2 footnotes.)
Routledge. Available from: Taylor & Francis, Ltd. 325 Chestnut Street Suite 800, Philadelphia, PA 19106. Tel: 800-354-1420; Fax: 215-625-2940; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Elementary Education; Grade 5
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Assessments and Surveys: Iowa Tests of Basic Skills