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ERIC Number: ED510514
Record Type: Non-Journal
Publication Date: 2009-Feb
Pages: 46
Abstractor: As Provided
Reference Count: 27
Value-Added to What? How a Ceiling in the Testing Instrumental Influences Value-Added Estimation. Working Paper 2008-21
Koedel, Cory; Betts, Julian
National Center on Performance Incentives
Value-added measures of teacher quality may be sensitive to the quantitative properties of the testing instruments upon which they are based. This paper focuses on the sensitivity of value-added to test-score-ceiling effects. Test-score ceilings are increasingly common in testing instruments across the country as education policy continues to emphasize proficiency-based reform. Encouragingly, we show that over a wide range of test-score ceiling severity, teachers' value-added estimates are only negligibly influenced by ceiling effects. However, as ceiling conditions approach those found in minimum-competency testing environments, value-added results are significantly altered. We suggest a simple statistical check for ceiling effects. (Contains 2 figures, 10 tables and 24 footnotes.)
National Center on Performance Incentives. Peabody College of Vanderbilt University, PMB #43, 230 Appleton Place, Nashville, TN 37203. Tel: 615-322-5538; Fax: 615-322-6018; e-mail:; Web site:
Publication Type: Reports - Descriptive
Education Level: Elementary Secondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: Vanderbilt University, National Center on Performance Incentives
Identifiers - Location: Mississippi