Comparison of a Randomized and Two Quasi-Experimental Designs in a Single Outcome Evaluation

Leona S. Aiken, Stephen G. West, David E. Schwalm, James L. Carroll and Shenghwa Hsiung
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Leona S. Aiken: Arizona State University
Stephen G. West: Arizona State University
David E. Schwalm: Arizona State University
James L. Carroll: VIA, Incorporated
Shenghwa Hsiung: Arizona State University

Evaluation Review, 1998, vol. 22, issue 2, 207-244

Abstract: The authors assessed the impact of three designs (randomized experiment, nonequivalent control group design, regression discontinuity design) on estimates of effect size of a university-level freshman remedial writing program. Designs were implemented within the same context, same time frame, and with the same population. The 375 freshman participants were either randomly assigned or self-selected into specific evaluation groups, according to design protocols. The three designs led to highly similar effect size estimates of the impact of a semester of remedial writing on writing outcomes following standard freshman composition. Specific design features contributed to the convergence of effect size estimates across designs.

Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:sae:evarev:v:22:y:1998:i:2:p:207-244

DOI: 10.1177/0193841X9802200203

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