The FSGD looks right (you have a 2x4 design, so 8 classes, plus 2
covariates).
[1 1 -1 0 0 -1 0 0 0 0 0 0 0 0 0 0] tests for a difference between
NoFocus and RhFocus (No-RH)
[0 0 1 -1 0 1 -1 0 0 0 0 0 0 0 0 0] tests for a difference between
RhFocus and LhFocus (RH-RH)
probably you can figure out the rest from the pattern
On 5/2/14 4:40 PM, Kenza Drissi wrote:
Dear Marie,
I want to run a group analysis on a set of subjects, correcting for gender
(Male/Female), diagnois regarding epilepsy (no focus/focus in rh/focus in
lh/focus in both h), age and IQ. Should my FSGD file look somewhat
like this
below:
GroupDescriptorFile 2
Class NoFocus_Male
Class NoFocus_Female
Class RhFocus_Male
Class LhFocus_Male
Class BhFocus_Male
Class RhFocus_Female
Class LhFocus_Female
Class BhFocus_Female
Variables age IQ
If so, considering that I want to investigate the effect of epilepsy
on cortical
gyrification, what should my contrast matrix look like?
The hypothesis is that the gyrification index is diminished for epileptic
patients, probably more when there is bilateral focus.
I know that we need as many number as regressors, so I expect there to
be 10
numbers, is it so?
Thank you so very much for clarifying this point,
Kenza
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