Dear all,
I would like to control for nuisance variables (age, sex, hand) at group level. I have demeaned the values for these and entered them as covariates. Whilst I understand how to find correlations/additional effect of these, what I want is to control for them - i.e. get results independent of age, sex, hand. Would I achieve this by simply entering the 4 EVs (group mean + 3 additional measures) and a single contrast: 1 0 0 0? If not, how?
Thank you very much in advance!
Tia.
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