Bias-corrected Estimation of the Density of a Conditional Expectation in Nested Simulation Problems
Bias-corrected Estimation of the Density of a Conditional Expectation in Nested Simulation Problems
复制标题
嵌套模拟问题中条件期望密度的偏差校正估计
DOI:
10.1145/3462201
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发表时间:
2021
影响因子:
0.9
通讯作者:
Ruppert, David
中科院分区:
文献类型:
--
作者:
Yang, Ran;Kent, David;Apley, Daniel W.;Staum, Jeremy;Ruppert, David
Many two-level nested simulation applications involve the conditional expectation of some response variable, where the expected response is the quantity of interest, and the expectation is with respect to the inner-level random variables, conditioned on the outer-level random variables. The latter typically represent random risk factors, and risk can be quantified by estimating the probability density function (pdf) or cumulative distribution function (cdf) of the conditional expectation. Much prior work has considered a naïve estimator that uses the empirical distribution of the sample averages across the inner-level replicates. This results in a biased estimator, because the distribution of the sample averages is over-dispersed relative to the distribution of the conditional expectation when the number of inner-level replicates is finite. Whereas most prior work has focused on allocating the numbers of outer- and inner-level replicates to balance the bias/variance tradeoff, we develop a bias-corrected pdf estimator. Our approach is based on the concept of density deconvolution, which is widely used to estimate densities with noisy observations but has not previously been considered for nested simulation problems. For a fixed computational budget, the bias-corrected deconvolution estimator allows more outer-level and fewer inner-level replicates to be used, which substantially improves the efficiency of the nested simulation.
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DOI:
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发表时间:
1991
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
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1993
期刊:
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影响因子:
5.4
作者:
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DOI:
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发表时间:
2016
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
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发表时间:
2006
期刊:
Proceedings of the 2006 Winter Simulation Conference
影响因子:
--
作者:
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通讯作者:
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