You will have four regressors:
M-offset
F-offset
M-age-slope
F-age-slope
so use contrast [0.5 0.5 0 0] This averages the M and F offsets. You
could also do an F-test with contrast
1 0 0 0
0 1 0 0
On 9/30/2020 12:35 AM, WON JONG CHWA wrote:
External Email - Use Caution
Hello,
I am currently attempting a paired t-test of subjects between two time
points, regressing out the effects of age and gender. I am currently
running the paired analysis tutorial, and have done the step of
computing the differences between pairs using mris_preproc
--paired-diff. However, I am having trouble with the FSGD and contrast
files.
Currently, this is my FSGD file:
GroupDescriptorFile 1
Class M
Class F
Variables Age
Input subject1pair M 80
Input subject2pair F 82
...
I am not sure how to make the contrast file for this, I would like to
answer the question of " does the mean paired difference differ from
0, regressing out the effect of age and gender?"
Any assistance would be greatly appreciated.
William
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