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• W2909511507 abstract "The local volatility model is a widely used for pricing and hedging financial derivatives. While its main appeal is its capability of reproducing any given surface of observed option prices---it provides a perfect fit---the essential component is a latent function which can be uniquely determined only in the limit of infinite data. To (re)construct this function, numerous calibration methods have been suggested involving steps of interpolation and extrapolation, most often of parametric form and with point-estimate representations. We look at the calibration problem in a probabilistic framework with a nonparametric approach based on a Gaussian process prior. This immediately gives a way of encoding prior beliefs about the local volatility function and a hypothesis model which is highly flexible yet not prone to over-fitting. Besides providing a method for calibrating a (range of) point-estimate(s), we draw posterior inference from the distribution over local volatility. This leads to a better understanding of uncertainty associated with the calibration in particular, and with the model in general. Further, we infer dynamical properties of local volatility by augmenting the hypothesis space with a time dimension. Ideally, this provides predictive distributions not only locally, but also for entire surfaces forward in time. We apply our approach to S&P 500 market data." @default.
• W2909511507 created "2019-01-25" @default.
• W2909511507 creator A5058617210 @default.
• W2909511507 creator A5088690598 @default.
• W2909511507 date "2019-01-17" @default.
• W2909511507 modified "2023-09-27" @default.
• W2909511507 title "A Probabilistic Approach to Nonparametric Local Volatility" @default.
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• W2909511507 hasPublicationYear "2019" @default.
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