We are running this model 2x2 to examine a treatment study, so all subjects
(patients and controls) were scanned twice (so the model examines the Group
X Time interaction, with Time a repeated measure). We would like to examine
a symptom score obtained at all scans. How would one add a symptom
covariate to this model? Is it simply the addition of 4 EVs (control T1, control
T2, patient T1, patient T2) of the symptom score?? If so, I assume the
symptom score is demeaned seperately for each of these 4 conditions (control
T1, control T2, patient T1, patient T2).
Many thanks,
-Gabriel S. Dichter, PhD
UNC-Chapel Hill
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