On 20 February 2015 at 09:09, Letizia Casiraghi <[log in to unmask]> wrote:

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