ivrnd.m ivsurfparam.m ivtree.m Levy_process.m Levy_process_1.m pc.m plot_GEV_densities.m plot_returns.m stabrnd.m stabrnd_1.m varsim.m CF901.htm concentration_of_risk.m error_cauchy_quantile.m error_normal_quantile.m exp_volatility.m gev.m hill.m