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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

When the interaction term is statistically significant, it is necessary to follow a different procedure when interpreting the results. In most cases, this consists of plotting the interaction in a figure and determining which of the simple effects are significant. This section shows how to do this.

For example, assume that the preceding study with 30 participants is repeated, but that this time the analysis is performed on the following dataset:

 5 DATALINES; 6 1 1 08 7 1 1 13 8 1 1 04 9 1 1 11 10 1 1 05 11 1 2 17 12 1 2 12 13 1 2 20 14 1 2 14 15 1 2 16 16 1 3 31 17 1 3 24 18 1 3 37 19 1 3 30 20 1 3 32 21 2 1 16 22 2 1 10 23 2 1 25 24 2 1 15 25 2 1 14 26 2 2 21 27 2 2 13 28 2 2 16 29 2 2 12 30 2 2 17 31 ...

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