Hi,
I would like to run a higher level repeated measures analysis on a group of
8 subjects scanned twice including a covariate (time between 1st and 2nd
scan). I’m interested in the difference between the 1st and 2nd scan and the
effect of the time between the 2 scans. I’m not sure how to set up the
design. If I use the design for a paired t-test from your example on the
website and add the time difference (demeaned) as an extra EV the design
becomes rank deficient. Is there a way to set up a design combining the
repeated measures with the covariate or do I have to run these separately?
And if I have to run them separately, how do I set up the design for the
covariate? I’ve looked through the archives but couldn’t find a suitable answer.
Thanks,
Jeske
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