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help > Group effects in 2nd level analysis
May 25, 2018 06:05 PM | David Cochran
Group effects in 2nd level analysis
If I am comparing group differences in functional connectivity,
what is the difference between:
a) creating a "Group" variable that is 0 for controls and 1 for patients, and doing contrast [AllSubjects Group] = [0 1]
b) creating a "Control" variable that is 1 for controls and 0 for patients, and "Patient" variable that is 1 for patients and 0 for controls, and doing contrast [Patient Control] = [1 -1]
When I do the first, I have significant results at p-uncorrected 0.001 voxel-wise and p-FDR=0.05, but for the second I get no significant results.
a) creating a "Group" variable that is 0 for controls and 1 for patients, and doing contrast [AllSubjects Group] = [0 1]
b) creating a "Control" variable that is 1 for controls and 0 for patients, and "Patient" variable that is 1 for patients and 0 for controls, and doing contrast [Patient Control] = [1 -1]
When I do the first, I have significant results at p-uncorrected 0.001 voxel-wise and p-FDR=0.05, but for the second I get no significant results.
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| Title | Author | Date |
|---|---|---|
| David Cochran | May 25, 2018 | |
| Alfonso Nieto-Castanon | May 25, 2018 | |