Hi Rosalia,

It depends. Sometimes we want to demean EVs, sometimes we don't. It also depends on how the groups were coded and other factors. Maybe if you show the design or give more details it'd be simpler to comment.

Thanks

All the best,

Anderson

2015-01-24 17:54 GMT+00:00 Rosalia Dacosta Aguayo <[log in to unmask]>:

Dear FSL experts,

I have a question regarding covariating for dichotomic variables (1 or 0) when running randomise.

Should I sum all the 1 in the group A and make average of them and substract the average to every 1?

Thank you,

Rosalia.