Hi,
I'm doing a correlation between FA values and some psychological data with FSL and I'm quite new in this kind of analysis, so my question is: should I demeaned all the data? even age and gender (using them as covariates)? What's exactly the difference between demeaned or not in the result's interpretation?
I have also read something about add a column of "1" as EV in the GLM Setup to demand the regression, what about that?
Thank you so much in advance
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