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arXiv 1702.02777q-fin.STq-fin.MF
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粗糙波动率:来自期权价格的证据

Rough volatility: evidence from option prices

Giulia Livieri, Saad Mouti, Andrea Pallavicini, Mathieu Rosenbaum

摘要:

最近的研究表明,现货波动率可以很好地模拟粗糙随机波动率型动态。在这类模型中,对数波动率服从分数布朗运动,Hurst参数小于1/2。这一结果是使用历史价格数据的高频波动估计建立的。我们通过研究基于隐含波动率的现货波动率近似值来重新审视这一发现。使用短期标准普尔500指数的价值期权,我们能够确认波动性是粗略的。这里发现的赫斯特参数,顺序为0.3,略大于通常从历史数据中获得的。这很容易从平滑效应中解释,因为所考虑的期权的剩余到期时间。

英文摘要:

It has been recently shown that spot volatilities can be very well modeled by rough stochastic volatility type dynamics. In such models, the log-volatility follows a fractional Brownian motion with Hurst parameter smaller than 1/2. This result has been established using high frequency volatility estimations from historical price data. We revisit this finding by studying implied volatility based approximations of the spot volatility. Using at-the-money options on the S&P500 index with short maturity, we are able to confirm that volatility is rough. The Hurst parameter found here, of order 0.3, is slightly larger than that usually obtained from historical data. This is easily explained from a smoothing effect due to the remaining time to maturity of the considered options.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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