[R] [OT] factorial design

From: Edna Bell <edna.bell01_at_gmail.com>
Date: Mon, 03 Nov 2008 23:29:10 -0600


Dear R Gurus:

I vaguely remember reading that if interaction was present in a factorial design, then the main effect results were suspect.

However, I was reading a text which now uses the tests for main effects even if interaction is present.

Which is correct, please?

Thanks,
Edna Bell



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