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ERIC Number: EJ848095
Record Type: Journal
Publication Date: 2009
Pages: 18
Abstractor: As Provided
Reference Count: 24
ISBN: N/A
ISSN: ISSN-0013-1644
Using Item Response Theory and Model-Data Fit to Conceptualize Differential Item and Person Functioning for Students with Disabilities
Engelhard, George, Jr.
Educational and Psychological Measurement, v69 n4 p585-602 2009
The major purpose of this study is to describe a conceptual framework for examining differential item functioning (DIF) and differential person functioning (DPF) as types of model-data misfit within the context of assessing students with disabilities. Specifically, DIF and DPF can be viewed through the lens of residual analyses. Residual analyses can be used to explore DIF (item fit) as well as extended to explore DPF (person fit). One of the advantages of this conceptual framework is that the size of the subgroups can be quite small with interpretable results produced even for individuals. To illustrate this conceptual framework, Rasch measurement theory is used as the item response theory model. Methodological and theoretical issues are discussed. Data from a high-stakes assessment in mathematics in Georgia (Grade 7, geometry items) are used to illustrate the conceptual framework for students with disabilities. The substantive research questions used to illustrate the conceptual framework addresses whether modifications in test administration (use of resource guides or calculators) influence item functioning for students with disabilities (DIF analyses) and whether students with various disabilities differentially benefit from these modifications (DPF analyses). (Contains 2 figures and 5 tables.)
SAGE Publications. 2455 Teller Road, Thousand Oaks, CA 91320. Tel: 800-818-7243; Tel: 805-499-9774; Fax: 800-583-2665; e-mail: journals@sagepub.com; Web site: http://sagepub.com
Publication Type: Journal Articles; Reports - Research
Education Level: Grade 7
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Georgia
Identifiers - Assessments and Surveys: Georgia Criterion Referenced Tests