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arXiv 0802.0223q-fin.STstat.APstat.ME
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基于状态空间模型的多变量随机波动率

Multivariate stochastic volatility using state space models

K. Triantafyllopoulos

摘要:

本文利用状态空间模型,提出了一种求解多变量随机波动率的贝叶斯方法。采用对数收益的自回归模型。我们推广的倒Wishart分布,以允许不同的相关结构之间的观察和状态的创新向量,我们扩展的Wishart和多元奇异beta分布之间的卷积。基于广义逆Wishart分布和多元奇异Beta分布,提出了一个乘性模型来描述波动率的演化,并采用了灵活的序列波动率更新。所提出的波动率的算法是快速和计算量小,它可以用于在线预测。最后以8种货币的外汇汇率数据为例进行了说明。实证结果表明,时变相关性可以有效地估计,即使在高维数据的情况下。

英文摘要:

A Bayesian procedure is developed for multivariate stochastic volatility, using state space models. An autoregressive model for the log-returns is employed. We generalize the inverted Wishart distribution to allow for different correlation structure between the observation and state innovation vectors and we extend the convolution between the Wishart and the multivariate singular beta distribution. A multiplicative model based on the generalized inverted Wishart and multivariate singular beta distributions is proposed for the evolution of the volatility and a flexible sequential volatility updating is employed. The proposed algorithm for the volatility is fast and computationally cheap and it can be used for on-line forecasting. The methods are illustrated with an example consisting of foreign exchange rates data of 8 currencies. The empirical results suggest that time-varying correlations can be estimated efficiently, even in situations of high dimensional data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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