calc_gompertz_joint_parameters
                        Calculating the Gompertz model parameters for
                        joint survival
calc_gompertz_parameters
                        Calculating Gompertz model parameters
calc_gompertz_survival_probability
                        Calculating Gompertz survival probability
calc_optimal_risky_asset_allocation
                        Calculate optimal risky asset allocation
calc_purchasing_power   Calculate purchasing power
calc_retirement_ruin    Calculating retirement ruin probability
calc_risk_adjusted_return
                        Calculate risk adjusted return
life_tables             HMD life tables
plot_gompertz_calibration
                        Plotting the results of Gompertz model
                        calibration
plot_joint_survival     Plotting the results of Gompertz model
                        calibration for joint survival
plot_purchasing_power   Plotting changes to the purchasing power over
                        time
plot_retirement_ruin    Plotting retirement ruin
plot_risk_adjusted_returns
                        Plotting risk adjusted returns
print_currency          Printing currency values or percentages
read_hmd_life_tables    Reading HMD life tables
run_app                 Run a package app
