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ERIC Number: EJ960251
Record Type: Journal
Publication Date: 2012-Apr
Pages: 24
Abstractor: As Provided
Reference Count: 48
ISBN: N/A
ISSN: ISSN-0013-1644
Distinguishing Differential Testlet Functioning from Differential Bundle Functioning Using the Multilevel Measurement Model
Beretvas, S. Natasha; Walker, Cindy M.
Educational and Psychological Measurement, v72 n2 p200-223 Apr 2012
This study extends the multilevel measurement model to handle testlet-based dependencies. A flexible two-level testlet response model (the MMMT-2 model) for dichotomous items is introduced that permits assessment of differential testlet functioning (DTLF). A distinction is made between this study's conceptualization of DTLF and that of differential bundle functioning (DBF) with an emphasis on the practical utility of decomposing differential functioning into item- and testlet-specific components. A small-scale simulation study is also conducted to assess estimation of the MMMT-2 model and its measures of DIF and DTLF when compared with SIBTEST's estimation of DIF and DBF. Results support use of the MMMT-2 model for assessing impact, DIF, and DTLF for tests that include testlet-based dichotomous items with equal item discriminations. (Contains 3 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: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A