WALD LEMMA FOR SUMS OF ORDER-STATISTICS OF IID RANDOM-VARIABLES
WALD LEMMA FOR SUMS OF ORDER-STATISTICS OF IID RANDOM-VARIABLES
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DOI:
10.2307/1427625
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发表时间:
1991-09-01
影响因子:
1.2
通讯作者:
ROBERTSON, JB
中科院分区:
文献类型:
--
作者:
BRUSS, FT;ROBERTSON, JB
Let X1, X2, ..., X(n) be positive i.i.d. random variables with known distribution function having a finite mean. For a given s > 0 we define N(n) = N(n, s) to be the largest number k such that the sum of the smallest k Xs does not exceed s, and M(n) = M(n, s) to be the largest number k such that the sum of the largest k X's does not exceed s. This paper studies the precise and asymptotic behaviour of E(N(n)), E(M(n)), N(n), M(n), and the corresponding 'stopped' order statistics X(N(n)) and X(n - M(n) + 1) as n --> infinity, both for fixed s, and where s = s(n) is an increasing function of n.