Dear FSL experts,
We have one group of subjects which we are scanning under different
conditions/levels (longitudinal DTI). We would like to "compare
every condition/level with every other one".
With reference to the example on the FSL website, it is not clear to
me why it is necessary to include, in addition to subject means, one
EV _less_ than the number of levels and then test for
differences w.r.t. the mean.
So let's say we have 2 subjects (subj1-2) and 4 conditions (lev1-4)
- see example on FSL website. Would it be correct to modify this
example adding an EV (eg. as many additional EV as there are
levels) and then simply test _all_ contrasts? Below are the
matrices I would use in this case.
Thank you very much in advance for any help anyone may be able to
provide!
Nicola
- design.mat
EV1=subj1/EV2=subj2/EV3=lev1/EV4=lev2/EV5=lev3/EV6=lev4
1/0/1/0/0/0
1/0/0/1/0/0
1/0/0/0/1/0
1/0/0/0/0/1
0/1/1/0/0/0
0/1/0/1/0/0
0/1/0/0/1/0
0/1/0/0/0/1
- design.con
0/0/1/-1/0/0
0/0/1/0/-1/0
0/0/1/0/0/-1
0/0/0/1/-1/0
0/0/0/1/0/-1
0/0/0/0/1/-1
- design.fts
1/1/1/1