Discrete-Time Volatility Forecasting With Persistent Leverage Effect and the Link With Continuous-Time Volatility Modeling
具有持续性杠杆效应的离散时间波动率预测及其与连续时间建模的联系AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以标普500波动率预测、持续性杠杆效应、跳跃影响及连续时间随机波动率模型为核心,直接对应金融波动率方向。
具有持续性杠杆效应的离散时间波动率预测及其与连续时间建模的联系AI 解读 ↓
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We first propose a reduced-form model in discrete time for S&P 500 volatility showing that the forecasting performance can be significantly improved by introducing a persistent leverage effect with a long-range dependence similar to that of volatility itself. We also find a strongly significant positive impact of lagged jumps on volatility, which however is absorbed more quickly. We then estimate continuous-time stochastic volatility models that are able to reproduce the statistical features captured by the discrete-time model. We show that a single-factor model driven by a fractional Brownian motion is unable to reproduce the volatility dynamics observed in the data, while a multifactor Markovian model fully replicates the persistence of both volatility and leverage effect. The impact of jumps can be associated with a common jump component in price and volatility. This article has online supplementary materials.