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arXiv 2009.00874stat.COstat.ME
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Shapley效应下全局敏感性分析的一种简单算法

A simple algorithm for global sensitivity analysis with Shapley effects

Takashi Goda

摘要:

全局敏感性分析旨在测量不同变量或变量组对于感兴趣的量的可变性的相对重要性。在几个敏感性指标中,所谓的Shapley效应最近越来越受欢迎,主要是因为所有单个变量的Shapley效应被加总为总方差,这比称为主效应和总效应的经典敏感性指标提供了更好的可解释性。在本文中,假设所有的输入变量是独立的,我们引入了一个非常简单的蒙特卡罗算法来估计Shapley效应的所有个人变量同时,这大大简化了现有的算法提出的文献。我们提出了一个简短的Matlab实现我们的算法,并显示了一些数值结果。一个可能的扩展的情况下,输入变量是依赖的也进行了讨论。

英文摘要:

Global sensitivity analysis aims at measuring the relative importance of different variables or groups of variables for the variability of a quantity of interest. Among several sensitivity indices, so-called Shapley effects have recently gained popularity mainly because the Shapley effects for all the individual variables are summed up to the overall variance, which gives a better interpretability than the classical sensitivity indices called main effects and total effects. In this paper, assuming that all the input variables are independent, we introduce a quite simple Monte Carlo algorithm to estimate the Shapley effects for all the individual variables simultaneously, which drastically simplifies the existing algorithms proposed in the literature. We present a short Matlab implementation of our algorithm and show some numerical results. A possible extension to the case where the input variables are dependent is also discussed.

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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