Hi Malf,
Would you please be more specific about what you want to do?
Do you mean to catenate the time series data of 13 subjects in
order to run 3dTstat to get the mean? I just want to be sure
what average you are hoping to take.
If you do want to get that average of all the timeseries data,
then you can take the average for each subject, and then the
average of those averages (assuming each subject has the same
number of time points).
If that is not what you are looking for, please provide more
details.
- rick