add_spl_est             The additive spline estimator
aipwee_est              Prediction with a residual bias correction
                        estimator
bart_est                The BART estimator
gam_est                 The GAM estimator
get_ci                  This calculates an upper and lower bound from
                        bootstrap matrix
hi_est                  The Hirano and Imbens estimator
hi_sim_data             Simulated data from Hirano and Imbens (2004)
iptw_est                The inverse probability of treatment weighting
                        (iptw) estimator
ismw_est                The inverse second moment weighting (ismw)
                        estimator
iw_est                  The inverse weighting estimator (nonparametric
                        method)
nmes_data               Data set containing data from the National
                        Medical Expenditure Survey (NMES)
nw_est                  The Nadaraya-Watson modified estimator
overlap_fun             This function creates an overlapping dataset
prop_spline_est         The propensity-spline prediction estimator
reg_est                 The regression prediction estimator
scalar_wts              This function calculates scalar weights for use
                        in other models
sim_data                Simulated data from Schafer and Galagate (2015)
t_mod                   A function to estimate conditional expected
                        values and higher order moments
wtrg_est                The weighted regression estimator
