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Evaluation Review
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Nonequivalent Group Designs

The Use of ANCOVA, Multiple Regression, Repeated ANOVA, and Effect Size

Robert A. Karabinus

Northern Illinois University

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.

Evaluation Review, Vol. 7, No. 6, 841-850 (1983)
DOI: 10.1177/0193841X8300700608
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