Coherent random allocations, and the Ewens-Pitman formula

Coherent random allocations, and the Ewens-Pitman formula
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相干随机分配和 Ewens-Pitman 公式

DOI:
10.1007/s10958-006-0338-9
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发表时间:
2006
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--
通讯作者:
S. Kerov
S. Kerov
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作者:
S. Kerov

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假设有一个随机数 K 的正整数随机变量 S1, …, SK,它们在给定 K 的情况下是条件独立的,并且都具有相同的分布。随机整数划分 N = S1+ S2+ … + SKa 出现,我们用 PN 表示该划分对于固定 N 值的条件分布。我们证明分布 {PN}N=1∞ 形成金曼意义上的划分结构当且仅当它们受 Ewens-Pitman 公式支配。后者概括了著名的尤文斯采样公式,该公式在纯数学和应用数学中有大量应用。随机变量 K 和 Sj 的分布属于具有两个实数参数的整数分布族,我们称之为拟二项式。因此,每个 Ewens-Pitman 分布都是基于此类简单的整数分布的两阶段随机过程的结果。参考书目:25 种。
Assume that there is a random number K of positive integer random variables S1, …, SKthat are conditionally independent given K and all have identical distributions. A random integer partition N = S1+ S2+ … + SKarises, and we denote by PNthe conditional distribution of this partition for a fixed value of N. We prove that the distributions {PN}N=1∞form a partition structure in the sense of Kingman if and only if they are governed by the Ewens-Pitman Formula. The latter generalizes the celebrated Ewens sampling formula, which has numerous applications in pure and applied mathematics. The distributions of the random variables K and Sjbelong to a family of integer distributions with two real parameters, which we call quasi-binomial. Hence every Ewens-Pitman distribution arises as a result of a two-stage random procedure based on this simple class of integer distributions. Bibliography: 25 titles.
DOI: --
发表时间: 2008
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作者:
佐藤由紀子;金子文也;奥田晴宏;長野正展;出水庸介;土井光暢;田中正一;末宗洋;栗原正明;M. Nagano;M. Tanaka;石川奈保子;高崎紘臣
通讯作者: 高崎紘臣