The sum of squared intraday returns provides an unbiased and almost error-free measure of ex-post volatility. In this … paper we develop a nonlinear Autoregressive Fractionally Integrated Moving Average (ARFIMA) model for realized volatility …, which accommodates level shifts, day-of-the-week effects, leverage effects and volatility level effects. Applying the model …

realistic dynamics of riskneutral and realized volatilities. I provide evidence that the jump risk in volatility of long run … of the VIX or realized stock volatility. In contrast, a jump-in-volatility LRR model generates a smaller variance risk … premium but better fits the VIX and the realized stock volatility dynamics. Finally, jump-in-volatility models generate …