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A Step-by-Step Approach to Using SAS® for Univariate & Multivariate Statistics, Second Edition by Edward J. Stepanksi Ph.d., Larry Hatcher, Norm O'Rourke

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Example with a Significant Interaction

Remember that your initial hypothesis was that the investment scores would increase more for the experimental group than for the control group and that, to be supported, this hypothesis required a significant TIME × GROUP interaction. This section presents the results of an analysis of a different set of fictitious data: participant responses that will provide the desired interaction. You will see that it is necessary to perform several follow-up analyses when you obtain a significant interaction in a mixed-design ANOVA. The dataset for this appears below. Otherwise, the SAS program is the same as the previous example and need not be repeated here.

 7 DATALINES; 8 01 1 10 09 10 9 02 1 12 13 12 10 03 1 10 ...

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