HDtweedie_kfold_aug     Fit a penalized gamma augmentation model via
                        cross fitting
cv.hd2part              Cross validation for hd2part models
fit_subgroup_2part      Fitting subgroup identification models for
                        semicontinuous positive outcomes
hd2part                 Main fitting function for group lasso and
                        cooperative lasso penalized two part models
hdgamma                 Fitting function for lasso penalized gamma GLMs
plot.hd2part            Plot method for hd2part fitted objects
predict.cv.hd2part      Prediction function for fitted cross validation
                        hd2part objects
predict.hd2part         Prediction method for two part fitted objects
sim_semicontinuous_data
                        Generates data from a two part distribution
                        with a point mass at zero and heterogeneous
                        treatment effects
