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- W2158668132 abstract "We propose a method for finding the alternative distribution in importance sampling. The alternative distribution is optimal in the sense that the asymptotic variance is minimised for estimating tail probabilities of asymptotically normal statistics. Our contribution to importance sampling is three‐fold. To begin with, we obtain an explicit expression for the mean of the optimal alternative distribution and the expression motivates a recursive approximation algorithm. Secondly, a new multi‐dimensional exponential tilting formula is presented. Lastly, a conservative estimator of the variance is given to facilitate a quick comparison among different stratified sampling schemes in conjunction with importance sampling. Several numerical examples illustrating the efficacy of the proposed method are also included. These results indicate that the proposed method is considerably more efficient than the method based on large deviations theory and the efficiency gain is more significant in higher dimensions." @default.
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- W2158668132 date "2004-06-01" @default.
- W2158668132 modified "2023-10-18" @default.
- W2158668132 title "Efficient importance sampling for events of moderate deviations with applications" @default.
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- W2158668132 doi "https://doi.org/10.1093/biomet/91.2.471" @default.
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