[Freesurfer] Contrast of three groups

Hi FreeSurfers,

I have a more statistical question:

I have three groups of subjects and I want to examine the effect of a continuous variable (cognition). Is it possible to examine three groups? Or should I do pairwise comparisons? What would the contrast than look like? Something like this:

0 0 0 0 0 0 0.33 0.33 0.33

(first three zeros for the three groups; three zeros for age-correction; three weights for cognition scores)??

Thanks!

Heidi

================================================ Dr. Heidi Jacobs Postdoc researcher Faculty of Health, Medicine and Life Sciences School for Mental Health and Neurosciences Division Cognitive Neuropsychiatry and Clinical Neurosciences Alzheimer Center Limburg h.jacobs@maastrichtuniversity.nl www.maastrichtuniversity.nl www.heidijacobs.nl

Dr. Tanslaan 12, 6229 ET Maastricht P.O. Box 616, 6200 MD Maastricht, The Netherlands T +31 43 38 84 090 F +31 43 38 84 092 ================================================