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January 2022

Data analytic techniques for treatment outcome studies with pretest/posttest measurements: An extensive primer

Author(s): Sorensen, E. D., Howe, S. R.

Journal/Book: J Psychiatr Res. 1996; 30: The Boulevard, Langford Lane, Kidlington, Oxford, England OX5 1GB. Pergamon-Elsevier Science Ltd. 185-199.

Abstract: This paper discusses several data analytic techniques for examining treatment efficacy in pretest-posttest control group designs. The following approaches are described: ANOVA on post scores, ANOVA on difference scores, split-plot repeated measures ANOVA, profile analysis, and ANOCOVA with prescore as the co-variate. Guidelines for choosing between available techniques are provided; the primary focus here is on the nature of the null hypothesis, the assumptions underlying the approach, and the power of the procedure. The importance of examining the characteristics of the data set in selecting an analytic technique is illustrated. .

Note: Article LB Sheeber, Oregon Res Inst, 1715 Franklin Blvd, Eugene, OR 97403 USA

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