Hi,
I would like to conduct a subcortical shape analysis on several groups (4 groups). I would be interested by all contrasts, so I had a few questions:
1. When creating the design matrix, should I be ONLY using 1 and -1 to define groups or is there a way in FIRST to create one design matrix for analyses with more than 2 groups? Am I to create 6 different design matrices for all 6 possibles contrasts (1vs2, 1vs3, 1vs4, 2vs3, 2vs4, 3vs4)?
2. If 6 matrices are to be created, does it mean that also 6 different sets of .bvars files have also to be created? I guess so.
Thank you,
Shady
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