It`s a 'within-subjects"design, so it controls by randomizing order in which the cases are presented, and then only counting first response.
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@PhilosophyExp But, if it only count the first response, then there's only one measure per subject, right? How can it then be w/in subjects?
@badrescher I'll answer on Facebook, because 140 chars. But all subjects do all conditions, and I collect data from every response