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Purpose – The purpose of this paper is to propose a new method for estimating continuous‐time stochastic volatility (SV) models for the S&P 500 stock index process using intraday high‐frequency observations of both the S&P 500 index and the Chicago Board Options Exchange (CBOE) implied (or expected) volatility index (VIX). Design/methodology/approach – A primary purpose of the paper is to provide a framework for using intraday high‐frequency data of both the indices' estimates, in particular, for improving the estimation accuracy of the leverage parameter, that is, the correlation between the two Brownian motions driving the diffusive components of the price process and its spot variance process, respectively. Findings – Finite sample simulation results show that the proposed estimator delivers more accurate estimates of the leverage parameter than do existing methods. Research limitations/implications – The focus of the paper is on the Heston and non‐Heston leverage parameters. Practical implications – Finite sample simulation results show that the proposed estimator delivers more accurate estimates of the leverage parameter than do existing methods. Social implications – The research findings are important for the analysis of ultra high‐frequency financial data. Originality/value – The paper provides a framework for using intraday high‐frequency data of both indices' estimates, in particular, for improving the estimation accuracy of the leverage parameter, that is, the correlation between the two Brownian motions driving the diffusive components of the price process and its spot variance process, respectively.
Managerial Finance – Emerald Publishing
Published: Sep 27, 2011
Keywords: Volatility; Stock prices; Gearing; Continuous time; High‐frequency data; Stochastic volatility; Implied volatility; S&P500; VIX
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