Nonequivalent Group Designs

Robert A. Karabinus
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Robert A. Karabinus: Northern Illinois University

Evaluation Review, 1983, vol. 7, issue 6, 841-850

Abstract: In pretest-posttest nonequivalent group designs, naive use of analysis of covariance or multiple regression can lead to Type I errors. In the evaluation of a Title IV-C, ESEA project, thorough analysis of the interaction term of a repeated model analysis of variance was shown to help identify areas of significant change. Meaningful differences were also supported by the standardized difference score, Effect Size. It was suggested that a two-fold increase of Effect Size from pretest to posttest might be an effective guide in the determination of meaningfully significant change.

Date: 1983
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Persistent link: https://EconPapers.repec.org/RePEc:sae:evarev:v:7:y:1983:i:6:p:841-850

DOI: 10.1177/0193841X8300700608

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