Hi Gang,
1. Yes, in fact my data is FA scalar maps
2. Roughly yes, mean age for the two groups is about 3 years apart.
I would like to collapse the time dimension if possible yes, regardless of how many scans a subject has (2 or more).
Previously, I just did a simple t-test between groups or an ANCOVA with age and group as an indicator variable, following you instructions. All this was done only on the first timepoint scans.
This time I'd like to incorporate as many scans as possible in my model.
Thanks again,
Stathis