On the attainment of the cramer-rao bound in the sequential case
作者:
B.K Ghosh,
期刊:
Sequential Analysis
(Taylor Available online 1987)
卷期:
Volume 6,
issue 3
页码: 267-288
ISSN:0747-4946
年代: 1987
DOI:10.1080/07474948708836131
出版商: Marcel Dekker, Inc.
关键词: Sequential estimation;Cramkr Rao bound;optimum estimators;exponential families;unbiased estimation
数据来源: Taylor
摘要:
The Cramér Rao inequality in the sequential case gives a lower bound for thevariance of an unbiased estimator of a parametric function under finite stopping rules.This article shows that when the observations follow a one parameter exponential familyof distributions the bound can be attained for one or all values of the parameter under strictly sequential rules only in a very special case, namely, for the Bernoullidistribution. Some applications of the result to the construction of optimum estimators are also given. Our main result is a generalization of DeGroot's work for the Bernoulli distribution. Moreover, the main result along with Kagan's theorem can be treated as a generalization of Wijsman's work for nonsequential estimators.
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