I am trying to run a full factorial analysis on SPM5 for grey matter
volumes, but I am stuck on the contrasts
In the design matrix, I have the following
Column1 - Group1
Column2 - Group2
Column3 - Total Grey Matter (which I want to co-vary out)
Column4 - Behavioural score
I am trying to ascertain the effect of the behavioural scores on the
grey matter volumes for both groups.
I tried 1 1 0 -1, but that didn't seem to work
Please help
Many Thanks
Sarah
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