Hi,
A couple of quick questions about when setting up contrasts:
(1) If you have two regressors that at a lower level you set up:
R1 0 1
R2 1 0
And then you contrast: -1 1. Do you still have to be worried that the
contrast could stem from a difference that is below zero for both
regressors?
(2) When you have three groups can you set up your higher level contrast
this way to sum 0 (1 1 -2)?
Thanks!
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