The Local Whittle Estimator of Long Memory Stochastic Volatility
29 Pages Posted: 3 Nov 2008
Date Written: April 2001
We propose a new semiparametric estimator of the degree of persistence in volatility forlong memory stochastic volatility (LMSV) models. The estimator uses the periodogram ofthe log squared returns in a local Whittle criterion which explicitly accounts for the noise term in the LMSV model. Finite-sample and asymptotic standard errors for the estimator are provided. An extensive simulation study reveals that the local Whittle estimator is much less biased and yields more accurate confidence intervals than the widely-used GPH estimator. In an empirical analysis of the daily Deutschemark/Dollar exchange rate, the newestimator indicates stronger persistence in volatility than the GPH estimator, provided that a large number of frequencies is used.
Keywords: long-range dependence, nonlinearity, semiparametric estimation
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