It depends on the order that you specified them. You will have four groups
SczUrban
SczRural
HVUrban
HVRural
The interaction will be of the form
(SczUrban-SczRural)-(HVUrban-HVRural)
Look in the y.fsgd to see what the order of the classes is. You can then look
in the contrast folder at C.dat to get the + and - 1s used in the contrast.
On 12/9/2020 12:58 PM, vittal korann wrote:
External Email - Use Caution
Dear FreeSurfer experts,
I was running group interaction (for diagnosis and birthplace) in QDEC with
gyrification as a dependent variable and age, gender as nuisance factors.
In diagnosis, we have 2 groups: i) schizophrenic patients ii) healthy
volunteers.
Similarly, birthplace has 2 groups: i) urban ii) rural birth
For the above-said design, I got reddish yellow color results in the display
tab of Qdec.
So, my query is that do results indicate that patients who were born in urban
have a higher gyrification index than healthy volunteers who born in urban or
something else? Do I sound correct in decoding the interaction results? If not
please let me know the exact meaning of the results.
Looking forward to hearing from you.
Thanks,
Vittal
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