calc_hr_pi              Generate hazard ratio with prediction intervals
                        from parametric bootstrap simulation
calc_km_pi              Generate Kaplan-Meier curves with prediction
                        intervals from parametric bootstrap simulation
extract_km_pi           Functions to extract prediction intervals and
                        observed data
extract_sim             Functions to extract raw simulated samples
plot_hr_pi              Plot HR
plot_km_pi              Plot Kaplan-Meier curves with prediction
                        intervals from parametric bootstrap simulation
print.survparamsim.hrpi
                        Methods for S3 objects in the package
surv_param_sim          Simulation of parametric survival model
