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Bayesian Analysis of Stochastic Volatility Models

Eric Jacquier, Nicholas G. Polson and Peter E. Rossi
Journal of Business & Economic Statistics
Vol. 12, No. 4 (Oct., 1994), pp. 371-389
DOI: 10.2307/1392199
Stable URL: http://www.jstor.org/stable/1392199
Page Count: 19
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Bayesian Analysis of Stochastic Volatility Models
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Abstract

New techniques for the analysis of stochastic volatility models in which the logarithm of conditional variance follows an autoregressive model are developed. A cyclic Metropolis algorithm is used to construct a Markov-chain simulation tool. Simulations from this Markov chain converge in distribution to draws from the posterior distribution enabling exact finite-sample inference. The exact solution to the filtering/smoothing problem of inferring about the unobserved variance states is a by-product of our Markov-chain method. In addition, multistep-ahead predictive densities can be constructed that reflect both inherent model variability and parameter uncertainty. We illustrate our method by analyzing both daily and weekly data on stock returns and exchange rates. Sampling experiments are conducted to compare the performance of Bayes estimators to method of moments and quasi-maximum likelihood estimators proposed in the literature. In both parameter estimation and filtering, the Bayes estimators outperform these other approaches.

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