10 Sep
2013
10 Sep
'13
10:24 a.m.
Dear Freesufer experts. I am trying to run attached fsgd file in qdec or in GLM-fit. I just want to do a group comparison in which I compare cortical thickness between groups controlling for age.
when I run the analysis with age as a raw score - the results seems very strange - if i on the other hand convert age to z-scores (with a mean of 0) then results seems to be as I would expect
As I understand it - I do not need to centre Age in order to control for it?
So what is then going wrong when I run the analysis?
thanks
Olof