An advantage of MEDYAD is its flexibility with model estimation. It allows up to 12 mediators (6 if the mediator is measured on both members of the dyad or 12 if the measure is a feature of the dyad or only measured on one of its members). MEDYAD also allows for specification of 1 or 2 Xs and 1 or 2 Ys (depending on whether the variable is between-dyad or mixed). Bootstrapping methods are available for inference about specific indirect effects and contrasts between them.
In addition to the syntax version, a dialog box exists based on SPSS’ graphical user interface (GUI). Not all options are available in the dialog box, but it can be permanently installed and used for simple model estimation.
There are numerous other features available to researchers including (but certainly not limited to) options for controlling for covariates, printing descriptive statistics, and obtaining pairwise contrasts between specific indirect effects. MEDYAD, and other macros produced by the MAC lab, can also be found at afhayes.com. MEDYAD is currently in beta. If you would like to obtain a copy of it to use in your research (and, if applicable, report any bugs), please email me at email@example.com.