ensemble_range_map      Generate ensemble predictions from S4DM range
                        maps
evaluate_range_map      Evaluate S4DM range map quality
fit_density_ratio       Fit density-ratio distribution models in a
                        plug-and-play framework.
fit_plug_and_play       Fit presence-background distribution models in
                        a plug-and-play framework.
get_env_bg              Extract background data for SDM fitting.
get_env_pres            Extract presence data for SDM fitting.
get_response_curves     Generate Response Curves
make_range_map          Make a range map using plug-and-play modeling.
project_density_ratio   Projects fitted density-ratio distribution
                        models onto new covariates.
project_plug_and_play   Projects fitted plug-and-play distribution
                        models onto new covariates.
sample_points           Example S4DM occurrence data
sdm_threshold           Thresholds a continuous relative occurrence
                        rate raster to create a binary raster.
stratify_random         Split data for k-fold spatially stratified
                        cross validation
stratify_spatial        Split data for k-fold spatially stratified
                        cross validation
