add_index is a generic function that adds a
(moderated) indirect effect index to an object created with an
family function. This index is computed using Monte Carlo methods. This
function invokes particular methods depending of the class of the mediation
model. For example, with a model fitted with
add_index will invoke
add_index(mediation_model, times = 5000, level = 0.05, ...)
A mediation model fitted with an
Number of simulations to use to compute the Monte Carlo index's confidence interval.
Alpha threshold to use for the confidence interval.
Further arguments to be passed to specific methods.
An object of the same class as
mediation_model, but with index
added for later use.