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Hello Doug,

Do you mean like this?

GroupDescriptorFile 1

Title Rivermead cluster 2

DOSS

Class PPCS_Male

Class PPCS_Female

Variables Age Sports Games Days_TBI RPQ_13

If yes, i did but still getting similar area

Best,

Paul

On Tue, Jan 3, 2023 at 11:51 AM miracle ozzoude miracooloz@gmail.com wrote:

Hello Doug,

Thanks for the quick response. I did see the error. However, I specified doss in the mri_glmfit command and my mtx looks accurate as indicated above. Does that mean it can only work with dods? The reason I'm using 2 groups is because I want to regress out the effect of sex. However, the recommended way to do it in fsgd is to create a class for it and I only have 3 males.

Is there a workaround for this?

Many thanks.

On Fri, Dec 30, 2022 at 6:37 PM miracle ozzoude miracooloz@gmail.com wrote:

...

Hello,

I have 2 groups (group 1 = 3 members, group 2 = 12 members) and I did like to regress out the effects of groups + other variables by using doss. However, whenever I specify doss with the mri_glmfit command, it gives me an error message (see below). I saw that others have experienced similar issues without any solutions. How can we solve this? Any insight is appreciated.

Best, Paul

mri_glmfit command:

mri_glmfit --y ../../freesurfer/subjects/tracula_output/stats/mcp.avg16_syn_bbr.FA.nii.gz --fsgd dti_RPQ_3.fsgd doss --C dti_RPQ.mtx --o mcp_FA.glmdir --save-eres --nii.gz

design.mtx:

0 0 0 0 0 0 0.5

Terminal output:

gdfRead(): reading dti_RPQ_3.fsgd

INFO: DeMeanFlag keyword not found, DeMeaning will NOT be done.

Continuous Variable Means (all subjects)

0 Age 46.9333 9.86216

1 Sports 0.0666667 0.249444

2 Games 1.13333 1.62754

3 Days_TBI 1903.2 907.81

4 RPQ_3 7 2.28035

Class Size and Means of each Continuous Variable

1 PPCS_Male 3 33.3333 0.3333 2.3333 1337.3472 6.6667

2 PPCS_Female 12 50.3333 0.0000 0.8333 2044.6632 7.0833

ERROR: Class PPCS_Male has 3 members. With 5 variables and using DODS, you need at least 6 members