RTI Press Method Report
Analyzing data from nonrandomized group studies
Bray, J.W., Schlenger, W.E., Zarkin, G.A., & Galvin, D.M. (November 2008).
Researchers evaluating prevention and early intervention programs must often rely on diverse study designs that assign groups to various study conditions (e.g., intervention versus control). Although the strongest designs randomly assign these groups to conditions, researchers frequently must use nonrandomized research designs in which assignments are made based on the characteristics of the groups. We provide guidance on which techniques work best under different data conditions and make recommendations to researchers about how to choose among the various techniques when analyzing data from a pre-test/post-test nonrandomized study.
Full Document: RTI Press - Methods Report 
PDF
Permanent Link: doi:10.3768/rtipress.2008.mr.0008.0811
Full Citation: Bray, J.W., Schlenger, W.E., Zarkin, G.A., & Galvin, D.M. (November 2008). Analyzing data from nonrandomized group studies. RTI Press Publication No. MR-0008-0811.
Abstract
Researchers evaluating prevention and early intervention programs must often rely on diverse study designs that assign groups to various study conditions (e.g., intervention versus control). Although the strongest designs randomly assign these groups to conditions, researchers frequently must use nonrandomized research designs in which assignments are made based on the characteristics of the groups. We provide guidance on which techniques work best under different data conditions and make recommendations to researchers about how to choose among the various techniques when analyzing data from a pre-test/post-test nonrandomized study.RTI Press Information
Bolded author names indicate current or past RTI employees. All rights reserved. Please note that RTI Press publications are copyrighted and credit must be provided to the authors and source of the document when you quote from it. You must not sell RTI Press publications or make a profit from reproducing them. PDF documents of RTI Press publications are available as free downloads as a public service of RTI International.
For RTI Press information, contact: