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ERIC Number: EJ1100479
Record Type: Journal
Publication Date: 2016-Jun
Pages: 31
Abstractor: As Provided
Reference Count: 29
ISBN: N/A
ISSN: ISSN-1076-9986
The Validity and Precision of the Comparative Interrupted Time-Series Design: Three Within-Study Comparisons
St. Clair, Travis; Hallberg, Kelly; Cook, Thomas D.
Journal of Educational and Behavioral Statistics, v41 n3 p269-299 Jun 2016
We explore the conditions under which short, comparative interrupted time-series (CITS) designs represent valid alternatives to randomized experiments in educational evaluations. To do so, we conduct three within-study comparisons, each of which uses a unique data set to test the validity of the CITS design by comparing its causal estimates to those from a randomized controlled trial (RCT) that shares the same treatment group. The degree of correspondence between RCT and CITS estimates depends on the observed pretest time trend differences and how they are modeled. Where the trend differences are clear and can be easily modeled, no bias results; where the trend differences are more volatile and cannot be easily modeled, the degree of correspondence is more mixed, and the best results come from matching comparison units on both pretest and demographic covariates.
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: National Science Foundation (NSF)
Authoring Institution: N/A
Identifiers - Location: Florida; Indiana
Grant or Contract Numbers: DRL1228866