arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.08154stat.COecon.EMstat.APstat.ME
收藏

多元因子随机波动率模型的有效贝叶斯推断

Efficient Bayesian Inference for Multivariate Factor Stochastic Volatility Models

Gregor Kastner, Sylvia Frühwirth-Schnatter, Hedibert Freitas Lopes

摘要:

通过因子随机波动模型讨论了多元时间序列中动态协方差阵的有效贝叶斯估计。特别地,我们提出了两种交织策略(Yu和Meng,Journal of Computational and Graphical Statistics,20(3),531-570,2011)以显著加速标准MCMC方法的收敛和混合。类似于边际数据增强技术,建议的加速程序利用非可识别性问题,经常出现在因素模型。我们的新交织策略很容易实现,几乎没有额外的计算成本,然而,它们可以提高估计效率的几个数量级,如在广泛的模拟研究中所示。最后,我们的算法应用到26维汇率数据集说明了优越的性能,新的方法对现实世界的数据。

英文摘要:

We discuss efficient Bayesian estimation of dynamic covariance matrices in multivariate time series through a factor stochastic volatility model. In particular, we propose two interweaving strategies (Yu and Meng, Journal of Computational and Graphical Statistics, 20(3), 531-570, 2011) to substantially accelerate convergence and mixing of standard MCMC approaches. Similar to marginal data augmentation techniques, the proposed acceleration procedures exploit non-identifiability issues which frequently arise in factor models. Our new interweaving strategies are easy to implement and come at almost no extra computational cost; nevertheless, they can boost estimation efficiency by several orders of magnitude as is shown in extensive simulation studies. To conclude, the application of our algorithm to a 26-dimensional exchange rate data set illustrates the superior performance of the new approach for real-world 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。

↑