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An empirical application of stochastic volatility models

โœ Scribed by Ronald J. Mahieu; Peter C. Schotman


Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
335 KB
Volume
13
Category
Article
ISSN
0883-7252

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โœฆ Synopsis


This paper studies the empirical performance of stochastic volatility models for twenty years of weekly exchange rate data for four major currencies. We concentrate on the eects of the distribution of the exchange rate innovations for both parameter estimates and for estimates of the latent volatility series. The density of the log of squared exchange rate innovations is modelled as a ยฏexible mixture of normals. We use three dierent estimation techniques: quasi-maximum likelihood, simulated EM, and a Bayesian procedure. The estimated models are applied for pricing currency options. The major ยฎndings of the paper are that:

(1) explicitly incorporating fat-tailed innovations increases the estimates of the persistence of volatility dynamics; (2) the estimation error of the volatility time series is very large; (3) this in turn causes standard errors on calculated option prices to be so large that these prices are rarely signiยฎcantly dierent from a model with constant volatility.


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