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arXiv 0812.1084math.STstat.TH
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贝叶斯指数相合性的充要条件

Both necessary and sufficient conditions for Bayesian exponential consistency

Yang Xing, Bo Ranneby

摘要:

在过去的十年中,贝叶斯非参数过程的渐近理论有了显著的发展。指数一致性在这方面发挥了重要作用。已知$f_0$在先验的Kullback-Leibler支持下的条件不能保证后验的指数一致性。许多作者得到了后验的指数相合性的额外充分条件,例如,参见Schwartz(1965),Barron,Schervish and Wasserman(1999),Ghosal,Ghosh and Ramamoorthi(1999),Walker(2004),Xing and Ranneby(2008)。然而,由于Kullback-Leibler支持条件,很少知道的充要条件和充分条件。本文给出了一类既有充要条件。作为结果,我们得到了一个简单的贝叶斯指数一致性的充分条件,这是弱于以前的充分条件。

英文摘要:

The last decade has seen a remarkable development in the theory of asymptotics of Bayesian nonparametric procedures. Exponential consistency has played an important role in this area. It is known that the condition of $f_0$ being in the Kullback-Leibler support of the prior cannot ensure exponential consistency of posteriors. Many authors have obtained additional sufficient conditions for exponential consistency of posteriors, see, for instance, Schwartz (1965), Barron, Schervish and Wasserman (1999), Ghosal, Ghosh and Ramamoorthi (1999), Walker (2004), Xing and Ranneby (2008). However, given the Kullback-Leibler support condition, less is known about both necessary and sufficient conditions. In this paper we give one type of both necessary and sufficient conditions. As a consequence we derive a simple sufficient condition on Bayesian exponential consistency, which is weaker than the previous sufficient conditions.

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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