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Nonequivalent Group Designs

Author

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  • Robert A. Karabinus

    (Northern Illinois University)

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.

Suggested Citation

  • Robert A. Karabinus, 1983. "Nonequivalent Group Designs," Evaluation Review, , vol. 7(6), pages 841-850, December.
    • Handle: RePEc:sae:evarev:v:7:y:1983:i:6:p:841-850
    DOI: 10.1177/0193841X8300700608
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    References listed on IDEAS

    as
    1. Leonard Feldt, 1958. "A comparison of the precision of three experimental designs employing a concomitant variable," Psychometrika, Springer;The Psychometric Society, vol. 23(4), pages 335-353, December.
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