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arXiv 1104.1464math.PR
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稀有事件概率的零方差估计

Towards zero variance estimators for rare event probabilities

Michel Broniatowski, Virgile Caron

摘要:

改进稀有事件概率的重要抽样估计需要条件密度的精确近似。这是针对事件E_{n}实现的:=(f(X_{1})+.+ f(X_{n}))\inA_{n},其中被加数是i.i.d.而E_{n}是大或中等偏差事件。当k_{n} /n \to 1时,对于1个\leqi \leqk_{n}和相对于E_{n}的长期运行,处理了真实r.v的X_{i}的条件密度的近似。讨论了在给定精度下k的最大值,给出了算法和仿真结果。

英文摘要:

Improving Importance Sampling estimators for rare event probabilities requires sharp approximations of conditional densities. This is achieved for events E_{n}:=(f(X_{1})+...+f(X_{n}))\inA_{n} where the summands are i.i.d. and E_{n} is a large or moderate deviation event. The approximation of the conditional density of the real r.v's X_{i} 's, for 1\leqi\leqk_{n} with repect to E_{n} on long runs, when k_{n}/n\to1, is handled. The maximal value of k compatible with a given accuracy is discussed; algorithms and simulated results are presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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