Estimate unconstrained model parameters.
unconstrained.unpenalized(Y, M, A, C = NULL)
A list containing point estimates of the unconstrained model parameters.
A (n x 1) continuous outcome vector.
A (n x p_m) matrix of mediators.
A (n x 1) vector of exposures.
A (n x p_c) matrix of confounders and adjustment covariates. If there are no confounders or adjustment covariates set C = NULL.