Thanks for your reply!
This is my contrast matrix:
EV1 EV2 EV3 EV4 EV5 EV6
group1>group2 1 -1 0 0 0 0
group1>group3 1 0 -1 0 0 0
group1<group2 -1 1 0 0 0 0
group1<group3 -1 0 1 0 0 0
group2>group3 0 1 -1 0 0 0
group3<group2 0 -1 1 0 0 0
EV1 and EV3 are for pathological subjects and EV2 is for control subjects, while EV4, EV5 and EV6 are respectively for age, sex and mean FA.
What I want to check is the difference between subjects in terms of FA maps.
Kind regards.
Letizia
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