order effects (Simon Makin )

Subject: order effects
From:    Simon Makin  <s.makin(at)DCS.SHEF.AC.UK>
Date:    Mon, 3 Jun 2002 19:52:21 +0100

Hi hearing folks, I have a quick question about experimental design: I have three related stimuli sets I want to analyse together, but due to not really being able to shut subjects up in a booth for hours at a time I was planning to seperate them into three seperate sessions. Now - the kind of stimuli I'm using are known to be subject to training effects, so is it enough to counterbalance by assigning each subject to a different, random, order of sessions (1,2,3 - 1,3,2 - 2,1,3 - 2,3,1 etc..), or do I have to be careful to assign the same number of subjects to each of the possible six orders? In which case, what do I do if I can't get a multiple of 6 subjects? Thanks in advance for any advice... Cheers, Si.

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Electrical Engineering Dept., Columbia University