Dear Mark,
thanks for you quick response!
When I use a single EV that contains the values -1 and +1,according to group, how many contrasts should I choose (two contrasts: 1, -1 and one f-test option)?
One more question, according to Paul's one: how could i coding the "Group" EV and the corresponding contrasts for an analysis with three or four group?
All the best,
Roberta
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