Dear Expert
I have 3 groups ( A,B,C )
The goal is to compare their MRI images and also do a correlational analysis of their scores in a psychological test.
Can I simply use VBM?
I included ALL subjects in VBM.
The following are my settings in Glm GUI.
(1) 3 groups and 2 groups comparison
[ Glm setting ]
group EV1 EV2 EV3 contrast EV1 EV2 EV3 F-test
1 1 0 0 1 1 *
1 1 0 0 2 1 *
2 0 1 0 3 1 *
2 0 1 0 4 1 -1
3 0 0 1 5 1 -1
3 0 0 1 6 -1 1
7 -1 1
8 1 -1
9 -1 1
(2) Correlational analysis --- all subjects as 1 group
group EV1
1 56
1 89
1 33
1 55
1 33
1 83
(3) Correlational analysis --- just focusing on group A
group EV1
1 56
1 89
0 0
0 0
0 0
0 0
I do get results.....but I am really confused.
Since I included ALL subjects in VBM, the template was built on based on ALL subjects, so I incorporate irrelevant information when I just do a 2 group comparison or 1 group correlational analysis???????
Thanks a lot.
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