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ERIC Number: ED519507
Record Type: Non-Journal
Publication Date: 2011
Pages: 9
Abstractor: ERIC
Reference Count: 15
The Role of Pretest and Proxy-Pretest Measures of the Outcome for Removing Selection Bias in Observational Studies
Hallberg, Kelly; Steiner, Peter M.; Cook, Thomas D.
Society for Research on Educational Effectiveness
The purpose of this paper is threefold. The first is to test whether the pretest plays a greater role in bias reduction than any other single covariate, which the authors predict it will. The second is to examine the marginal improvement in bias reduction offered by having two pretest measurement waves. The authors predict that there will be some marginal gain in bias reduction as a result of including an additional pretest wave. The third purpose is to examine the extent to which a proxy pretest measure can substitute for a real pretest whose form is invariant between pretest and posttest. (Contains 3 tables.)
Society for Research on Educational Effectiveness. 2040 Sheridan Road, Evanston, IL 60208. Tel: 202-495-0920; Fax: 202-640-4401; e-mail:; Web site:
Publication Type: Reports - Research
Education Level: Elementary Secondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: Society for Research on Educational Effectiveness (SREE)