Dear spmers,
I need some help about how to specify a VBM design matrix.
We have got two groups, patients and control subjects, aged from 10 to 15
years, paired in age and sex, two scans per subject. In the group of patients
the first scan was pre-treatment and the second one once it was finished. The
delay between scans was from 6 to 8 months.
We are looking for those differences in patient group that are just due to
treatment, that is, substracting the possible effect of growing, using the GS
volume, the age and the number of days between scans as a confounds and taking
into account that patients and control subjects were paired in age and sex. We
also would like to know if those differences are correlated or not with the
result of a neuropsicological test.
Any help on which is the best way to configure a statitical test with SPM2 to
answer the questions above will be much appreciated
Thank you very much
Yours
Carles Falcon
IDIBAPS- Hospital Clinic Barcelona
Unitat Biofísica i Bioenginyeria
F. Medicina. University of Barcelona (Spain)
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