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Statistical Estimation: Asymptotic Theory
Ibragimov, I. A ; Kotz, S ; Has'minskii, R. Z
New York, NY: Springer 1981
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Título:
Statistical Estimation: Asymptotic Theory
Autor:
Ibragimov, I. A
;
Kotz, S
;
Has'minskii, R. Z
Assuntos:
Asymptotic expansions
;
Distribution (Probability theory
;
Mathematics
;
Mathematics and Statistics
;
Probability Theory and Stochastic Processes
Descrição:
when certain parameters in the problem tend to limiting values (for example, when the sample size increases indefinitely, the intensity of the noise ap proaches zero, etc.) To address the problem of asymptotically optimal estimators consider the following important case. Let X 1, X 2, ... , X n be independent observations with the joint probability density !(x,O) (with respect to the Lebesgue measure on the real line) which depends on the unknown patameter o e 9 c R1. It is required to derive the best (asymptotically) estimator 0:( X b ... , X n) of the parameter O. The first question which arises in connection with this problem is how to compare different estimators or, equivalently, how to assess their quality, in terms of the mean square deviation from the parameter or perhaps in some other way. The presently accepted approach to this problem, resulting from A. Wald's contributions, is as follows: introduce a nonnegative function w(0l> ( ), Ob Oe 9 (the loss function) and given two estimators Of and O! n 2 2 the estimator for which the expected loss (risk) Eown(Oj, 0), j = 1 or 2, is smallest is called the better with respect to Wn at point 0 (here EoO is the expectation evaluated under the assumption that the true value of the parameter is 0). Obviously, such a method of comparison is not without its defects.
Títulos relacionados:
Stochastic Modelling and Applied Probability
Editor:
New York, NY: Springer
Data de criação/publicação:
1981
Formato:
410
Idioma:
Inglês
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