We propose novel nonparametric estimators for stochastic volatility and the volatility of volatility. In doing so, we … relax the assumption of a constant volatility of volatility and therefore, we allow the volatility of volatility to vary … Standard & Poor´s 500 equity index, the estimates revealed strong evidence that both volatility and the volatility of …

forecasting horizons. Therefore, a long memory volatility model compared to a short memory GARCH model does not appear to improve …

The present research investigates the impact of trading volume on stock return volatility using data from the Greek … banking system. For our analysis, the empirical study uses daily measures of volatility constructed from intraday data for the … on stock return volatility mainly in all quantiles. The findings extrapolated are of relevance and interest to financial …