METRIC MARGINAL PROBLEMS FOR SET-VALUED OR NONMEASURABLE VARIABLES

被引:1
|
作者
DUDLEY, RM
机构
[1] Department of Mathematics, Massachusetts Institute of Technology, Cambridge, 02139-4307, MA
关键词
Mathematics Subject Classifications: 60B05; 60B10;
D O I
10.1007/BF01199264
中图分类号
O21 [概率论与数理统计]; C8 [统计学];
学科分类号
020208 ; 070103 ; 0714 ;
摘要
In a separable metric space, if two Borel probability measures (laws) are nearby in a suitable metric, then there exist random variables with those laws which are nearby in probability. Specifically, by a well-known theorem of Strassen, the Prohorov distance between two laws is the infimum of Ky Fan distances of random variables with those laws. The present paper considers possible extensions of Strassen's theorem to two random elements one of which may be (compact) set-valued and/or non-measurable. There are positive results in finite-dimensional spaces, but with factors depending on the dimension. Examples show that such factors cannot entirely be avoided, so that the extension of Strassen's theorem to the present situation fails in infinite dimensions.
引用
收藏
页码:175 / 189
页数:15
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