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Hi Matteo, C1 and C3 are the same. C2 and C4 are the same. These are the ones for your hypotheses. The others aren't. All the best, Anderson On 9 June 2015 at 10:45, Matteo Diano <[log in to unmask]> wrote: > Dear FSL experts, > i have 3 Groups with Age de-mean as a covariate and i would make the right > contrasts. > Here my contrasts: > > G1 G2 G3 age_D > C1 -1 0.5 0.5 0 > C2 1 -0.5 -0.5 0 > C3 -2 1 1 0 > C4 2 -1 -1 0 > C5 0 1 -1 0 > C6 0 -1 1 0 > C7 1 -1 0 0 > C8 -1 1 0 0 > C9 1 0 -1 0 > C10 -1 0 1 0 > > I want to compare the G2 and G3 togheter versus G1. I tried to make these > contrasts in C1,C2,C3,C4 but i don't know which combination is the right > one. > Thank you very much for your helpfulness. > Regards > > Matteo >