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I want to know how to do a mediation analysis with repeated measures. Here is a fake experiment that has the same form as the one I plan to do (using a fake one lets me simplify some weird complications I already know how to deal with):

For each of 5 targets, 100 participants answer 3 questions:

  1. How warm do you find this person?
  2. How trustworthy do you find this person?
  3. How likely would you be to follow this person's advice.

If there were only 1 target, I would know how to do a mediation analysis to (e.g.,) see whether the relationship between (1) and (3) was mediated by (2). However, I don't know how to do it with 5 targets. Clearly, I should not just average together the scores across all 5 scenarios. And I should not treat each case as different (as though I had 500 participants).

Any suggestions would be hugely appreciated!

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At least one method for doing this has been published in: Judd et al. Estimating and testing mediation and moderation in within-subject designs. Psychological methods (2001) vol. 6 (2) pp. 115-134 http://www.ncbi.nlm.nih.gov/pubmed/11411437

I haven't yet found a link to code that implements this method though.

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    $\begingroup$ Could you add a brief summary of this paper? $\endgroup$
    – chl
    May 22, 2014 at 12:43

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