Topic
Natural exponential family
About: Natural exponential family is a research topic. Over the lifetime, 1973 publications have been published within this topic receiving 60189 citations. The topic is also known as: NEF.
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TL;DR: In this paper, the problem of estimating the unknown parameter of a one-parameter exponential family with the conjugate prior is considered, and the most robust and conditional Γ-minimax estimators are constructed.
22 citations
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22 citations
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01 Jan 2009TL;DR: In this article, the authors consider the problem of estimating the probability that the sample mean of n independent identically distributed light tailed (i.e., with finite moment generating function in a neighborhood of the origin) random variables lies in a sufficiently regular closed convex set.
Abstract: We revisit a classical problem in rare-event simulation, namely, efficient estimation of the probability that the sample mean of n independent identically distributed light tailed (i.e. with finite moment generating function in a neighborhood of the origin) random variables lies in a sufficiently regular closed convex set that does not contain their mean. It is well known that the optimal exponential tilting (OET), although logarithmically efficient, is not strongly efficient (typically, the squared coefficient of variation of the estimator grows at rate n 1/2). After discussing some important differences between the optimal change of measure and OET (for instance, in the one dimensional case the size of the overshoot is bounded for the optimal importance sampler and of order O(n 1/2) for OET) that indicate why OET is not strongly efficient, we provide a state-dependent importance sampling that can be proved to be strongly efficient. Our procedure is obtained based on computing the optimal tilting at each step, which corresponds to the solution of the Isaacs equation studied recently by Dupuis and Wang 8.
22 citations
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TL;DR: In this paper, the existence problem for the optimal parameters for the exponential function approximating these data in the sense of total least squares was considered and sufficient conditions were given to guarantee the existence of such optimal parameters.
Abstract: Given the data , i = 1,...,m, we consider the existence problem for the optimal parameters for the exponential function approximating these data in the sense of total least squares. We give sufficient conditions which guarantee the existence of such optimal parameters.
22 citations