REPRESENTATIONS FOR PARTIALLY EXCHANGEABLE ARRAYS OF RANDOM-VARIABLES

REPRESENTATIONS FOR PARTIALLY EXCHANGEABLE ARRAYS OF RANDOM-VARIABLES
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DOI:
10.1016/0047-259x(81)90099-3
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发表时间:
1981-01-01
影响因子:
1.6
通讯作者:
ALDOUS, DJ
ALDOUS, DJ
中科院分区:
数学2区
文献类型:
--
作者:
ALDOUS, DJ

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考虑一个随机变量数组(Xi,j),1 ≤i,j< ∞,使得行或列的排列不会改变数组的分布。我们证明了这样的阵列可以表示为函数f(α,λ i,ηj,λi,j)的基础i.i.d,随机变量。这一结果可能是有用的,在表征阵列的附加结构。例如,我们刻画了正交旋转下分布不变的随机矩阵,证实了Dawid的一个猜想。
Consider an array of random variables (Xi,j), 1 ≤i,j< ∞, such that permutations of rows or of columns do not alter the distribution of the array. We show that such an array may be represented as functionsf(α,ξi,ηj,λi,j) of underlying i.i.d, random variables. This result may be useful in characterizing arrays with additional structure. For example, we characterize random matrices whose distribution is invariant under orthogonal rotation, confirming a conjecture of Dawid.