Admissibility Results for Generalized Bayes Estimators of Coordinates of a Location Vector
Berger, James O.
Ann. Statist., Tome 4 (1976) no. 1, p. 334-356 / Harvested from Project Euclid
Let $X$ be an $n$-dimensional random vector with density $f(x - \theta)$. It is desired to estimate $\theta_1$, under a strictly convex loss $L(\delta - \theta_1)$. If $F$ is a generalized Bayes prior density, the admissibility of the corresponding generalized Bayes estimator, $\delta_F$, is considered. An asymptotic approximation to $\delta_F$ is found. Using this approximation, it is shown that if (i) $f$ has enough moments, (ii) $L$ and $F$ are smooth enough, and (iii) $F(\theta) \leqq K(|\theta_1| + \sum^n_{i=2} \theta_i^2)^{(3-n)/2}$, then $\delta_F$ is admissible for estimating $\theta_1$. For example, assume that $F(\theta) \equiv 1$ and that $L$ is squared error loss. Under appropriate conditions it can be shown that $\delta_F(x) = x_1$, and that $\delta_F$ is the best invariant estimator. If, in addition, $f$ has 7 absolute moments and $n \leqq 3$, it can be concluded that $\delta_F$ is admissible.
Publié le : 1976-03-14
Classification:  Admissibility,  generalized Bayes estimators,  location vector,  62C15,  62F10,  62H99
@article{1176343410,
     author = {Berger, James O.},
     title = {Admissibility Results for Generalized Bayes Estimators of Coordinates of a Location Vector},
     journal = {Ann. Statist.},
     volume = {4},
     number = {1},
     year = {1976},
     pages = { 334-356},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1176343410}
}
Berger, James O. Admissibility Results for Generalized Bayes Estimators of Coordinates of a Location Vector. Ann. Statist., Tome 4 (1976) no. 1, pp.  334-356. http://gdmltest.u-ga.fr/item/1176343410/