Do you mean mediation as in mediation of effects, or as in conflict management?

I mean statistical mediation.

I guess the mediation package in R would do the trick.

Thanks.

Hello Berna,

have you found a good reference for this question yet? I am searching for the same!

This paper by Finley et al http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3076684/ was helpful for me; it reports a mixed modelling mediation analyses for a dichotomous dependent variable and names relevant references (see results and discussion Experiment 1). However, our statistician is sceptical about the calculation of the standard errors, so I am still looking for other examples.

Best, Gesa