Dear SPMers,
I have a 4x2 within-subjects design with the following columns in my design matrix:
columns 1-4: main effect of F1 (4 levels)
columns 5-6: main effect of F2 (2 levels)
columns 7-14: Interaction F1 F2
I figured out the right contrast weights for the main effects but what are the weights for the interaction contrast?
Thank you in advance,
AJ
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