Rate of Convergence in the Compound Decision Problem for Two Completely Specified Distributions
Hannan, J. F. ; Ryzin, J. R. Van
Ann. Math. Statist., Tome 36 (1965) no. 6, p. 1743-1752 / Harvested from Project Euclid
Simultaneous consideration of $n$ statistical decision problems having identical generic structure constitutes a compound decision problem. The risk of a compound decision problem is defined as the average risk of the component problems. When the component decisions are between two fully specified distributions $P_0$ and $P_1, P_0 \neq P_1$, Hannan and Robbins [2] give a decision function whose risk is uniformly close (for $n$ large) to the risk of the best "simple" procedure based on knowing the proportion of component problems in which $P_1$ is the governing distribution. This result was motivated by heuristic arguments and an example (component decisions between $N(-1, 1)$ and $N(1, 1))$ given by Robbins [4]. In both papers, the decision functions for the component problems depended on data from all $n$ problems. The present paper considers, as in Hannan and Robbins [2], compound decision problems in which the component decisions are between two distinct completely specified distributions. The decision functions considered are those of [2]. The improvement is in the sense that a convergence order of the bound is obtained in Theorem 1. Higher order bounds are attained in Theorems 2 and 3 under certain continuity assumptions on the induced distribution of a suitably chosen function of the likelihood ratio of the two distributions.
Publié le : 1965-12-14
Classification: 
@article{1177699802,
     author = {Hannan, J. F. and Ryzin, J. R. Van},
     title = {Rate of Convergence in the Compound Decision Problem for Two Completely Specified Distributions},
     journal = {Ann. Math. Statist.},
     volume = {36},
     number = {6},
     year = {1965},
     pages = { 1743-1752},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1177699802}
}
Hannan, J. F.; Ryzin, J. R. Van. Rate of Convergence in the Compound Decision Problem for Two Completely Specified Distributions. Ann. Math. Statist., Tome 36 (1965) no. 6, pp.  1743-1752. http://gdmltest.u-ga.fr/item/1177699802/