Dear "SPMers",
I am running a study where 2 groups of subjects undergo 6 scans in each
of 2 conditions. One of the contrasts I wish to look at is differences
between the 2 groups irrespective on the condition. I have entered the
study as "multi-study, with replications" with 2 groups and 2 conditions
in each group.
I enetered the following contrst matrix:
Contrast: 1 2 3 4 5 6 7 8 9 10 11 12
13 14
1 -1 1 -1 -1 1 -1 1 0 0 0 0
-1 1
-1 1 1 -1 1 -1 1 -1 0 0 -1 1
0 0
-1 1 -1 1 -1 1 0 0 -1 1 0 0
1 -1
1 -1 -1 1 1 -1 0 0 1 -1 1 -1
0 0
However what appears on the F map page of the output is:
Contrast: 1 2 3 4 5 6 7 8 9 10 11 12
1 -1 -1 1 -1 1 0 0 0.5 -0.5 -0.5
0.5
-1 1 1 -1 1 -1 0 0 -0.5 0.5 0.5
-0.5
-1 1 -1 1 0 0 -1 1 -0.5 0.5 0.5
-0.5
1 -1 1 -1 0 0 1 -1 0.5 -0.5 -0.5
0.5
Explanations please. Am I trying to do something invalid? Do I re-run
the analysis as 2 groups with 1 condition?
Thanks for any help
Mark
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