Tools and Tutorials
A tutorial on mediation analysis with SAS, SPSS, and Stata Macros:
Valeri, L. and VanderWeele, T.J. (2013). Mediation analysis allowing for exposure-mediator interactions and causal interpretation: theoretical assumptions and implementation with SAS and SPSS macros. Psychological Methods, 18:137-150.
A DRAFT of a tutorial on interaction analysis with SAS and Stata code:
VanderWeele, T.J. and Knol, M.J. (2013). A tutorial on interaction. Epidemiologic Methods.
An Excel spreadsheet to carry out power and sample size calculations for additive and multiplicative interactions (see Appendix 2 for instructions):
VanderWeele, T.J. (2012). Sample size and power calculations for additive interactions. Epidemiologic Methods, 1:159-188.