Dear Guillaume,
Thank you for clarifying that the order of covariates in the design matrix does not affect the results. And thanks for sharing Will Penny´s code on github (I remember him giving a lecture on Group Analysis when I attended the SPM course).
I have some ambidextrous patients that´s why dummy coding (1 0) for handedness seemed not so straightforward in this case but I presume I´ll have either to discard these patients or code them as 1 or 0.
Best wishes,
Noelia
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