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arXiv 2103.01357math.STstat.TH
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非高斯平稳时间序列谱密度的后验一致性

Posterior consistency for the spectral density of non-Gaussian stationary time series

Yifu Tang, Claudia Kirch, Jeong Eun Lee, Renate Meyer

摘要:

平稳时间序列的贝叶斯谱密度估计的各种非参数方法已在文献中提出,大多基于Whittle似然近似。Kirch等人已经提出了这种近似的推广,他们证明了谱密度估计与高斯时间序列的Bernstein-Dirichlet过程先验的后验一致性。在本文中,我们将后验一致性结果推广到非高斯时间序列,采用了一般的一致性定理的Shalizi依赖数据和错误指定的模型。作为特例,Choudhuri,Ghosal和Roy提出的Whittle似然谱密度的后验一致性也被推广到非高斯时间序列.这种方法的小样本特性与非高斯时间序列的几个例子说明。

英文摘要:

Various nonparametric approaches for Bayesian spectral density estimation of stationary time series have been suggested in the literature, mostly based on the Whittle likelihood approximation. A generalization of this approximation has been proposed in Kirch et al. who prove posterior consistency for spectral density estimation in combination with the Bernstein-Dirichlet process prior for Gaussian time series. In this paper, we will extend the posterior consistency result to non-Gaussian time series by employing a general consistency theorem of Shalizi for dependent data and misspecified models. As a special case, posterior consistency for the spectral density under the Whittle likelihood as proposed by Choudhuri, Ghosal and Roy is also extended to non-Gaussian time series. Small sample properties of this approach are illustrated with several examples of non-Gaussian time series.

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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