Hello!
I am running a script with 3dMVM command for group-level analysis between 2 groups (CT, KI). I have 3 between-subject variables (Group, Sex, Age) and 1 within-subject variable (Scan).
I was expecting the output for group difference from F-test and t-test would come out the same as there 2 groups, but the output came different. After clusterization with 6 voxels at p<0.05, there are 11 clusters for F-test and 10 for the t-test (attached picture). My question is why the F-test and t-test came different?
Code:
3dMVM -prefix MVM_emx_baseline_splitBLOCK_E_Cov_AgenSex.nii -jobs 28 \
-bsVars 'Group*Sex+Group*Age' \
-wsVars 'Scan' \
-qVars 'Age' \
-num_glt 3 \
-gltLabel 1 CT-KI -gltCode 1 'Group : 1*CT -1*KI' \
-gltLabel 2 Group_by_Scan -gltCode 2 'Group : 1*CT -1*KI Scan : 1*th1 -1*th2' \
-gltLabel 3 th1-th2 -gltCode 3 'Scan : 1*th1 -1*th2' \