Helper function to marginalize outcome regression over mediator distributions. Used to get each of the relevant nuisance parameters needed to evaluate the total, direct, and indirect effects.

Helper function to marginalize outcome regression over mediator distributions. Used to get each of the relevant nuisance parameters needed to evaluate the total, direct, and indirect effects.

get_Qbarbar(
  Qbar_n,
  Q_M_n,
  unique_M1_values,
  unique_M2_values,
  all_mediator_values,
  ...
)