BTW, I just "fix" the problem not changing UFP value (i tried, but nothing happened), but changing variance to equal in the factor, so that, if i got it, the script simply "bypass" the "problematic" part.
But this leaves me with a doubt: while make (in part) sense to me to set variance "equal" for the factor "task" (all subjects do perform the same task), it make no sense to set the variance to "equal" in the subject factor, beacuse of corse the subjects have unequal variance beetwen them.
So, is it correct ?
F.
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