Hybrid scheme for Brownian semistationary processes

Mikkel Bennedsen (), Asger Lunde () and Mikko S. Pakkanen ()
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Mikkel Bennedsen: Aarhus University and CREATES, Postal: Department of Economics and Business Economics, Fuglesangs Allé 4, 8210 Aarhus V, Denmark
Asger Lunde: Aarhus University and CREATES, Postal: Department of Economics and Business Economics, Fuglesangs Allé 4, 8210 Aarhus V, Denmark
Mikko S. Pakkanen: Imperial College London and CREATES, Postal: Department of Mathematics, Imperial College London, South Kensington Campus, London SW7 2AZ, UK

CREATES Research Papers from Department of Economics and Business Economics, Aarhus University

Abstract: We introduce a simulation scheme for Brownian semistationary processes, which is based on discretizing the stochastic integral representation of the process in the time domain. We assume that the kernel function of the process is regularly varying at zero. The novel feature of the scheme is to approximate the kernel function by a power function near zero and by a step function elsewhere. The resulting approximation of the process is a combination of Wiener integrals of the power function and a Riemann sum, which is why we call this method a hybrid scheme. Our main theoretical result describes the asymptotics of the mean square error of the hybrid scheme and we observe that the scheme leads to a substantial improvement of accuracy compared to the ordinary forward Riemann-sum scheme, while having the same computational complexity. We exemplify the use of the hybrid scheme by two numerical experiments, where we examine the finite-sample properties of an estimator of the roughness parameter of a Brownian semistationary process and study Monte Carlo option pricing in the rough Bergomi model of Bayer et al. (2015), respectively.

Keywords: Stochastic simulation; discretization; Brownian semistationary process; stochastic volatility; regular variation; estimation; option pricing; rough volatility; volatility smile. JEL Classification: C22, G13, C13 (search for similar items in EconPapers)
Pages: 31
Date: 2015-09-14
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Citations: View citations in EconPapers (13)

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