# 12.7 - TukeyHSD() and Interactions

12.7 - TukeyHSD() and Interactions

We've already introduced TukeyHSD() for testing all pairwise comparisons in our model. He're we'll demonstrate why control of the family-wise error provided by TukeyHSD() is so important - as we'll see adding an interaction greatly increases the number of pairwise comparisons.

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