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arXiv 2104.11643math.STstat.MEstat.TH
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无先验贝叶斯预测推理

Bayesian predictive inference without a prior

Patrizia Berti, Emanuela Dreassi, Fabrizio Leisen, Pietro Rigo, Luca Pratelli

摘要:

设$(X_n:n\ge 1)$为随机观测序列。设$σ_n(\cdot)=P\bigl(X_{n+1}\in\cdot\mid X_1,\ldots,X_n\bigr)$为第$n$个预测分布,$σ_0(\cdot)=P(X_1\in\cdot)$为$X_1$的边缘分布。在贝叶斯框架中,要对$(X_n)$进行预测,只需要集合$σ=(σ_n:n\ge 0)$。由于Ionescu-Tulcea定理,$σ$可以直接分配,而无需通过通常的先验/后验方案。一个主要优点是不必选择先验概率。在本文中,$σ$受到两个要求:(i)所得到的序列$(X_n)$是条件同分布的,在Berti,Pratelli和Rigo(2004)的意义下;(ii)每个$σ_{n+1}$是$σ_n$的简单递归更新。介绍并研究了满足(i)-(ii)的各种新的$σ$。对于这样的$σ$,确定$σ_n$的渐近性,作为$n\rightarrow\infty$。在某些情况下,还评估了$(X_n)$的概率分布。

英文摘要:

Let $(X_n:n\ge 1)$ be a sequence of random observations. Let $σ_n(\cdot)=P\bigl(X_{n+1}\in\cdot\mid X_1,\ldots,X_n\bigr)$ be the $n$-th predictive distribution and $σ_0(\cdot)=P(X_1\in\cdot)$ the marginal distribution of $X_1$. In a Bayesian framework, to make predictions on $(X_n)$, one only needs the collection $σ=(σ_n:n\ge 0)$. Because of the Ionescu-Tulcea theorem, $σ$ can be assigned directly, without passing through the usual prior/posterior scheme. One main advantage is that no prior probability has to be selected. In this paper, $σ$ is subjected to two requirements: (i) The resulting sequence $(X_n)$ is conditionally identically distributed, in the sense of Berti, Pratelli and Rigo (2004); (ii) Each $σ_{n+1}$ is a simple recursive update of $σ_n$. Various new $σ$ satisfying (i)-(ii) are introduced and investigated. For such $σ$, the asymptotics of $σ_n$, as $n\rightarrow\infty$, is determined. In some cases, the probability distribution of $(X_n)$ is also evaluated.

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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