Dear FSL experts,
I want to build design matrix and contrast for my TBSS data so I can use it in the command "randomise". The data is FA maps ( for 50 subjects) and the design model is for three groups and two covariates ( one continuous-AGE and the second one categorical-gender).
Regarding design.mat ( the example bellow is just for 9 subjects and 3 groups for illustration purposes)
Group EV1 EV2 EV3 EV4 EV5
input1 1 1 0 0
input2 1 1 0 0
input3 1 1 0 0
input4 1 0 1 0
input5 1 0 1 0
input6 1 0 1 0
input7 1 0 0 1
input8 1 0 0 1
input9 1 0 0 1
.
.
EV1, EV2 EV3 are the groups 1 , 2, 3
EV4 demeaned age
EV5 demeaned gender ( male =1, female=2)
The contrasts are
EV1>EV2 1 -1 0 0 0
EV2>EV3 0 1 -1 0 0
EV1>EV3 1 0 -1 0 0
positive EV4 effect 0 0 0 1 0
negative EV4 effect 0 0 0 -1 0
positive EV5 effect 0 0 0 01
negative EV5 effect 0 0 0 0 -1
Kindly is this model correct?
I highly appreciate your help!
Jon
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