I am currently running a higher-level analysis comparing
pre and post sessions using a paired t-test design matrix.
Between these sessions the subjects performed some training.
I would like to add a covariate (of no interest) which is a demeaned
average of their movement amplitude during training.
1) Is ev5 the correct way to add my demeaned behavioral covar?
2)Is this design matrix correct (shortened version), as at the moment I get
a rank deficient warning?
group ev1 ev2 ev3 ev4 ev5
1 1 1 0.85
1 1 1 -0.64
1 1 1 0.15
1 -1 1 0.85
1 -1 1 -0.64
1 -1 1 0.15
thanks for any information,
Joe
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