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Finance and Stochastics

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05-06-2020

Realised volatility and parametric estimation of Heston SDEs

Authors: Robert Azencott, Peng Ren, Ilya Timofeyev

Published in: Finance and Stochastics | Issue 3/2020

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Abstract

We present a detailed analysis of observable moment-based parameter estimators for the Heston SDEs jointly driving the rate of returns \((R_{t})\) and the squared volatilities \((V_{t})\). Since volatilities are not directly observable, our parameter estimators are constructed from empirical moments of realised volatilities \((Y_{t})\), which are of course observable. Realised volatilities are computed over sliding windows of size \(\varepsilon \), partitioned into \(J(\varepsilon )\) intervals. We establish criteria for the joint selection of \(J(\varepsilon )\) and of the subsampling frequency of return rates data.

We obtain explicit bounds for the \(L^{q}\) speed of convergence of realised volatilities to true volatilities as \(\varepsilon \to 0\). In turn, these bounds provide also \(L^{q}\) speeds of convergence of our observable estimators for the parameters of the Heston volatility SDE.

Our theoretical analysis is supplemented by extensive numerical simulations of joint Heston SDEs to investigate the actual performances of our moment-based parameter estimators. Our results provide practical guidelines for adequately fitting Heston SDE parameters to observed stock price series.

previous article A splitting strategy for the calibration of jump-diffusion models

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Title: Realised volatility and parametric estimation of Heston SDEs
Authors: Robert Azencott
Peng Ren
Ilya Timofeyev
Publication date: 05-06-2020
Publisher: Springer Berlin Heidelberg
Published in: Finance and Stochastics / Issue 3/2020
Print ISSN: 0949-2984
Electronic ISSN: 1432-1122
DOI: https://doi.org/10.1007/s00780-020-00427-2

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