Sorry, I just find that my message was ananymous. I rewrite it with my
signature. :-)
Hello,
I'm new at SnPM and I'm struggling to analyze FDG-PET data of 3 groups
(1scan/sub) using SnPM.
Number of subjects are 7(Gr1-patient1), 9(Gr2-patient2) and 16(Gr3-
controls). Gr1 and Gr2 have 2 disease-related covariates, and Age(for all 3
groups) will be treated as a nuisance variable.
I installed snpm3 with spm2, matlab7 in windows XP machine.
As I have no idea how to put three groups and three covariates(Gr3 doesn't
have two of them!) in one model, firstly I tried '>2 groups' plugin
provided in SnPM3. I took 1000 permutation. And as usual for all SPM
beginners, I got error message, as below.
SnPM: snpm_cp
========================================================================
Initialising...
Working on correct permutation...
??? Error using ==> snpm_cp
No voxels in brain
I tried 2groups two-sample t-test to compare two patients group(Gr1-Gr2)
and got same error again.
Could anybody give me any suggestion?
Sould I go back with these dataset to SPM instead of pouring my energy and
time on SnPM?
Hyo-Jeong Lee
Postdoctoral fellow
INSERM U742 ANiM (Action - Neuroimagerie - Modélisation)
Mailing address: Laboratoire de Neurosciences Cognitives
Departement d'Etudes Cognitives
Ecole Normale Superieure
29, rue d'Ulm, RDC bureau 72, 75005 Paris
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