Dear SPM experts,
At a DCM/PEB analysis, I have designed the matrix (100 100 110 110 101 101) to compare three groups (one between-subject factor) and I have got the following result: attached
As the groups B and C show additive effects (relative to A), is it correct to say that:
1. Group B has the same conections that group A, less the conection 1 to 2 (+0.07 –0.07 = 0)?
2. Group C has the same conections that group A, less the conection 2 to 3?
If I had compared only the groups A and B using a design matrix (10 10 11 11), what could I say about the comparison between them? attached
Thanks a lot.
Helka
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