Please excuse for my ignorance. I have another question:
I would like to correlate age within my FA. I have constructed the following (simplified, not exact):
/NumWaves 2
/NumPoints 7
/Matrix
1 10
1 11
1 9
1 8
1 12
1 14
1 13
/NumWaves 2
/NumContrasts 2
/Matrix
1 0
-1 0
I used the following command:
randomise -i all_FA_skeletonised -o tbss -m mean_FA_skeleton_mask -d design.mat -t design.con -n 500 --T2 -D
It gave me a warning: You have demeaned your data, but at least one design column has non-zero mean
One-sample design detected: sign-flipping instead of permuting
Also, is it true that if I have missing values (lets say subject 3 and 5 has no age information), I need to assign a new EV for each of the missing value? For example:
/NumWaves 3
/NumPoints 7
/Matrix
1 10 0 0
1 11 0 0
1 0 1 0
1 8 0 0
1 0 0 1
1 14 0 0
1 13 0 0
/NumWaves 2
/NumContrasts 2
/Matrix
1 0 0 0
-1 0 0 0
What did I do wrong?
Thank you in advance!
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