NotesFAQContact Us
Search Tips
Peer reviewed Peer reviewed
Direct linkDirect link
ERIC Number: EJ805764
Record Type: Journal
Publication Date: 2008-Jul
Pages: 28
Abstractor: As Provided
Reference Count: 31
ISSN: ISSN-1530-5058
Use of Item Models in a Large-Scale Admissions Test: A Case Study
Sinharay, Sandip; Johnson, Matthew S.
International Journal of Testing, v8 n3 p209-236 Jul 2008
"Item models" (LaDuca, Staples, Templeton, & Holzman, 1986) are classes from which it is possible to generate items that are equivalent/isomorphic to other items from the same model (e.g., Bejar, 1996, 2002). They have the potential to produce large numbers of high-quality items at reduced cost. This article introduces data from an application of item models for the generation of items for a large-scale assessment and investigates several research questions associated with the data. We begin by reviewing calibration techniques for the analysis of data involving item models; one method assumes that the items are isomorphic, while the other treats items generated from the same item model as distinct but related. A major question for these types of data is whether these items are isomorphic; that is, if they behave the same psychometrically. This article describes a number of rough diagnostic measures and a statistical diagnostic to assess the extent of isomorphicity in the items generated from an item model. Finally, this article discusses the issue of scoring--an area that needs more research--with data involving item models. (Contains 4 tables and 9 figures.)
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 - Research
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Assessments and Surveys: Graduate Record Examinations