Hi,
I found significant group by age interaction in the FA maps at cluster level t>2.3, p<0.05. In order to get a better picture
of what was happening, I tested on the individual group slopes with the contrasts below. The problem is that there were no significant effects. Any suggestions about how can i get better interpretation of the interaction effect?
grp1 grp2 age_grp1 age_grp2
c1: 0 0 1 0
c2: 0 0 -1 0
c3: 0 0 0 1
c4: 0 0 0 -1
In addition, the interaction effect was found in the first contrast below where slope1 > slope 2.
grp1 grp2 age_grp1 age_grp2
c1: 0 0 1 -1
c2: 0 0 -1 1
Thanks for any help!
Best,
Qin
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