Efficient estimation of integrated volatility in presence of infinite variation jumps
存在无限变差跳跃时积分波动率的有效估计AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确研究高频离散观测下的积分波动率估计,并处理无限变差跳跃,直接对应波动率与高频计量。
存在无限变差跳跃时积分波动率的有效估计AI 解读 ↓
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We propose new nonparametric estimators of the integrated volatility of an Itô semimartingale observed at discrete times on a fixed time interval with mesh of the observation grid shrinking to zero. The proposed estimators achieve the optimal rate and variance of estimating integrated volatility even in the presence of infinite variation jumps when the latter are stochastic integrals with respect to locally “stable” Lévy processes, that is, processes whose Lévy measure around zero behaves like that of a stable process. On a first step, we estimate locally volatility from the empirical characteristic function of the increments of the process over blocks of shrinking length and then we sum these estimates to form initial estimators of the integrated volatility. The estimators contain bias when jumps of infinite variation are present, and on a second step we estimate and remove this bias by using integrated volatility estimators formed from the empirical characteristic function of the high-frequency increments for different values of its argument. The second step debiased estimators achieve efficiency and we derive a feasible central limit theorem for them.