Statistics – Computation
Scientific paper
2008-05-14
Journal of the American Statistical Association 104, 1071-1079 (2009)
Statistics
Computation
Accepted for publication in Journal of the American Statistical Association (JASA)
Scientific paper
10.1198/jasa.2009.tm08152
Consider the observation of n iid realizations of an experiment with d>1 possible outcomes, which corresponds to a single observation of a multinomial distribution M(n,p) where p is an unknown discrete distribution on {1,...,d}. In many applications, the construction of a confidence region for p when n is small is crucial. This concrete challenging problem has a long history. It is well known that the confidence regions built from asymptotic statistics do not have good coverage when n is small. On the other hand, most available methods providing non-asymptotic regions with controlled coverage are limited to the binomial case d=2. In the present work, we propose a new method valid for any d>1. This method provides confidence regions with controlled coverage and small volume, and consists of the inversion of the "covering collection"' associated with level-sets of the likelihood. The behavior when d/n tends to infinity remains an interesting open problem beyond the scope of this work.
Chafai Djalil
Concordet Didier
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