predict_betas           Compute posterior predictive evaluates of
                        covariate effect functions.
sparseVCBART_cs         Fit a sparse VCBART model with compound
                        symmetry error structure
sparseVCBART_ind        Fit a sparse VCBART model with independent
                        error structure
summarize_beta          Compute posterior mean and 95% credible
                        interval for evaluations of each coefficient
                        function.
