arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0811.4677math.STmath.PRstat.TH
收藏

无IID结构观测值的后验分布的收敛速度

Convergence rates of posterior distributions for observations without the iid structure

Yang Xing

摘要:

在贝叶斯非参数过程的渐近性研究中,一致指数相容检验存在的经典条件被广泛采用。因为我们遵循贝叶斯方法,所以探索包含先验分布的替代和适当条件似乎更自然。本文给出了一个新的先验相关积分条件,建立了不一定独立同分布观测值的一般后验收敛速度定理。Ghosal和van der Vaart \cite{ghv1}最近研究了这种观测的后验收敛速度。我们还采用了Xing和Ranneby给出的Hausdorff $α$ -熵\cite{xir1} \cite{xi1},它也是先验依赖的,并且比广泛使用的度量熵要小.这导致了几个现有定理的扩展。特别地,我们建立了一般Markov过程的后验收敛速度定理,并作为其应用,改进了目前已知的非线性自回归模型的后验收敛速率.

英文摘要:

The classical condition on the existence of uniformly exponentially consistent tests for testing the true density against the complement of its arbitrary neighborhood has been widely adopted in study of asymptotics of Bayesian nonparametric procedures. Because we follow a Bayesian approach, it seems to be more natural to explore alternative and appropriate conditions which incorporate the prior distribution. In this paper we supply a new prior-dependent integration condition to establish general posterior convergence rate theorems for observations which may not be independent and identically distributed. The posterior convergence rates for such observations have recently studied by Ghosal and van der Vaart \cite{ghv1}. We moreover adopt the Hausdorff $α$-entropy given by Xing and Ranneby \cite{xir1}\cite{xi1}, which is also prior-dependent and smaller than the widely used metric entropies. These lead to extensions of several existing theorems. In particular, we establish a posterior convergence rate theorem for general Markov processes and as its application we improve on the currently known posterior rate of convergence for a nonlinear autoregressive model.

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。

↑