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How would one model the interaction term for a 2x8 (group x condition) interaction. From Dr. Glascher and Gitelman's tutorial I see a 2x3 interaction would be modelled as -1 0 1 1 0 -1. Does that mean that a 2x8 would be -1 -.714 -.429 -.143 .143 .429 .714 1 1 .714 .429 .143 -.143 -.429 -.714 -1 Thanks, David