Dear SPM users,
I am trying to perfom a One way ANOVA in SPM5 using the Full Factorial
Model, but there is no default for the F contrast to test if there is
a difference between three groups (one condition). I found some
information that mention that if I want to test if there is a
difference between n gropus I should use a contrast (matrix, contrast
weights) with n-1 lines. So, to test the difference between three
groups the contrast will be
c = 1 -1 0
0 1 -1
Can someone let me know if this is correct? Or should it be
c = 1 0 0
0 1 0
0 0 1
Thanks
Bedda Rosario
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