Hi Yang Hu,
The resulting design matrix likely contains the mean GM probability
value across all voxels for each subject - when you run randomise, it
will replace this column with the values at each voxel.
Cheers,
Paul
On 12/11/2018, huyang <[log in to unmask]> wrote:
> Dear FSL experts,
>
>
> Suppose I have two groups (3 subjects in each group), and a voxel-wise
> regressor (gray matter probability map), and I want to compare group
> difference after regressing out the gray matter effects. I searched the
> mail-list, and found the solution
> (https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind1503&L=fsl&P=R94997&1=fsl&9=A&I=-3&J=on&d=No+Match%3BMatch%3BMatches&z=4)
> by setting the design matrix like this:
> 1 0 1
>
> 1 0 1
>
> 1 0 1
>
> 0 1 1
>
> 0 1 1
>
> 0 1 1
> the third column would represent the voxel-wise regressor.
> However, when I use the Glm GUI to make the design matrix, by setting the
> "voxel-dependent EVs" to 1, the resulted design matrix would be different to
> the third column above. Specifically, the third column seems to be random
> numbers. Thanks in advance.
>
>
> Best,
>
>
> Yang Hu
>
>
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