Dear Guillaume,
Thank you for your reply.
Just to be sure, are these contrats right for the two sample t test including a covariable ?
* Correlation G1 and covariate [1 0 1 0] (ie [G1 G2 interaction1 interaction2])
* Correlation G2 an covariate [0 1 0 1]
* G1>G2 [0 0 1 -1]
Best regards
Caroline
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