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ERIC Number: EJ920306
Record Type: Journal
Publication Date: 2011-May
Pages: 9
Abstractor: As Provided
Reference Count: 34
ISSN: ISSN-0022-4669
Accommodations and Item-Level Analyses Using Mixture Differential Item Functioning Models
Scarpati, Stanley E.; Wells, Craig S.; Lewis, Christine; Jirka, Stephen
Journal of Special Education, v45 n1 p54-62 May 2011
The purpose of this study was to use differential item functioning (DIF) and latent mixture model analyses to explore factors that explain performance differences on a large-scale mathematics assessment between examinees allowed to use a calculator or who were afforded item presentation accommodations versus those who did not receive the same accommodations. Data from a state accountability assessment of mathematics for students in Grade 8 were analyzed. More than 73,000 students participated, of which 12,268 were students with disabilities (SWD) receiving test accommodations. DIF analyses detected performance differences between examinees without accommodations and those who used a calculator or those where the item presentation was altered. Latent performance class analyses revealed that performance differences were associated with item difficulty and ability in addition to accommodation status. Results support validity studies that use mixture models that can consider context variables related to item type, academic skills, and accommodations. (Contains 5 tables.)
SAGE Publications and Hammill Institute on Disabilities. 2455 Teller Road, Thousand Oaks, CA 91320. Tel: 800-818-7243; Tel: 805-499-9774; Fax: 800-583-2665; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: Grade 8; Secondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A