| cat_summary | Summarize Categorical Variables in Subgroup | 
| cdf_plot | CDF Plot for a biomarker | 
| cut_perf | Cutoff Performance Evaluation | 
| eval_metric_bin | Evaluation Metrics for XGBoostSub_bin Model | 
| eval_metric_con | Evaluation Metrics for XGBoostSub_con Model | 
| eval_metric_sur | Evaluation Metrics for XGBoostSub_sur Model | 
| fixcut_bin | Fixed Cutoff Analysis for Individual Biomarker Associated with Binary Outcome Variables | 
| fixcut_con | Fixed Cutoff Analysis for Individual Biomarker Associated with Continuous Outcome | 
| fixcut_sur | Fixed Cutoff Analysis for Individual Biomarker Associated with Survival Outcome | 
| gam_ctr_plot | GAM Contrast Plot | 
| gam_plot | GAM Plot | 
| get_subgroup_results | Get Subgroup Results | 
| predictive_biomarker_imp | Plot Predictive Biomarker Importance based on XGBoost-based Subgroup Model | 
| roc_bin | AUC ROC Table for Biomarkers Associated with Binary Outcomes | 
| roc_bin_plot | ROC Plot Biomarkers Associated with Binary Outcomes | 
| scat_cont_plot | Scatter Plot for a Biomarker Associated with Continuous Outcome | 
| subgrp_perf | Subgroup Performance Evaluation for Prognostic Cases | 
| subgrp_perf_pred | Subgroup Performance Evaluation for Predictive Cases | 
| tutorial_data | Tutorial Data | 
| XGBoostSub_bin | XGBoost Model with Modified Loss Function for Subgroup Identification with Binary Outcomes | 
| XGBoostSub_con | XGBoost Model with Modified Loss Function for Subgroup Identification with Continuous Outcomes | 
| XGBoostSub_sur | XGBoost Model with Modified Loss Function for Subgroup Identification with Survival Outcomes |