Muthén, B. (2011). Applications of causally defined direct and indirect effects in mediation analysis using SEM in Mplus.
which is on our web site under Papers, Mediation Modeling. Section 10 describes the sensitivity analysis proposed by Imai, inspecting the effect of confounding of the M->Y relationship. This confounding sensitivity analysis is very easy to do in Mplus.
Jon Heron posted on Thursday, May 10, 2012 - 7:54 am
I've been carrying that one around for a while, sounds like reading it would help :-)