Hi FSLers,
I am currently doing and unpaired two group comparison (A & B) with two
covariates (sex and handedness). It is in my understanding that I should
demean the covariates in order to add them to my design matrix following a:
Response or value - Mean value formula.
Is this correct? Specially since I am adding this covariates to the third
level analysis ( I have multiple runs). If so I also had the following
question when I demean like that do I demean for the mean of each separate
group (mean of A and mean of B)? Or do I demean for the mean of both groups
(mean of A + B)?
Thank you for your help.
--
Andres Roman
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