One-way ANOVA

AFNI Message Board
1

Hey,

I want to to run a one-way ANOVA (one factor with three levels – comparing functional connectivity between three groups) and I struggle a bit with the syntax. Would it be something like

3dANOVA -levels 3
-dset1 merged_first_group.nii.gz
-dset2 merged_second_group.nii.gz
-dset3 merged_third_group.nii.gz
-ftr Groups
-mean 1 group1
-mean2 group2
-mean3 group3
-diff 1 2 1vs2
-diff 2 3 2vs3
-diff 1 3 1vs3
-contr 1 1 -1
-contr -1 1 1
-contr 1 -1 1
-bucket /path_to_output/
?

Thanks a lot!
Lisa

2

Lisa,

Try this:

3dANOVA -levels 3
-dset 1 subject1_in_first_group.nii.gz
-dset 1 subject2_in_first_group.nii.gz
-dset 1 subject3_in_first_group.nii.gz
…
-dset 2 subject1_in_second_group.nii.gz
-dset 2 subject2_in_second_group.nii.gz
-dset 2 subject3_in_second_group.nii.gz
…
-dset 3 subject1_in_third_group.nii.gz
-dset 3 subject2_in_third_group.nii.gz
-dset 3 subject3_in_third_group.nii.gz
…
ftr Groups
-mean 1 group1
-mean2 group2
-mean3 group3
-diff 1 2 1vs2
-diff 2 3 2vs3
-diff 1 3 1vs3
-contr 1 1 -1
-contr -1 1 1
-contr 1 -1 1
-bucket /path_to_output/…