High Breakdown Point Conditional Dispersion Estimation with Application to S & P 500 Daily Returns Volatility
高崩溃点条件离散度估计:应用于标普500日收益波动率
The authors show that quasimaximum likelihood (QML) estimators for conditional dispersion models can be severely affected by a small number of outliers such as market crashes and rallies, and they propose new estimation strategies (the two-stage Hampel estimators and two-stage S-estimators) resistant to the effects of outliers and study the properties of these estimators. They apply their methods to estimate models of the conditional volatility of the daily returns of the…