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Comparative Analyses of Pretest-Posttest Research Designs

Donna R. Brogan and Michael H. Kutner
The American Statistician
Vol. 34, No. 4 (Nov., 1980), pp. 229-232
DOI: 10.2307/2684066
Stable URL: http://www.jstor.org/stable/2684066
Page Count: 4
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Comparative Analyses of Pretest-Posttest Research Designs
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Abstract

Two common methods of analyzing data from a two-group pretest-posttest research design are (a) two-sample t test on the difference score between pretest and posttest and (b) repeated-measures/ split-plot analysis of variance. The repeated-measures/split-plot analysis subsumes the t test analysis, although the former requires more assumptions to be satisfied. A numerical example is given to illustrate some of the equivalences of the two methods of analysis. The investigator should choose the method of analysis based on the research objective(s).

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