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arXiv 2006.02087math.STstat.TH
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Shapley效应估计的高斯线性逼近

Gaussian linear approximation for the estimation of the Shapley effects

Baptiste Broto, François Bachoc, Marine Depecker, Jean-Marc Martinez

摘要:

在本文中,我们解决的敏感性指标称为“Shapley效应”的估计。这些灵敏度指数使得能够处理相关输入变量。Shapley效应通常难以估计,但在高斯线性框架中很容易计算。本文的目的是在一个近似的高斯线性框架中使用Shapley效应的值作为对应于非线性模型的真实Shapley效应的估计。首先,我们假设输入变量是具有小方差的高斯。我们提供的速度收敛的估计Shapley效应到真正的Shapley效应。然后,我们专注于输入由非高斯经验均值给出的情况。证明了在适当的假设下,当经验均值中的项数增加时,真实Shapley效应与由高斯线性逼近给出的估计Shapley效应之间的差收敛于0.我们的理论结果得到了数值研究的支持,表明高斯线性逼近是准确的,并能够显着减少计算时间。

英文摘要:

In this paper, we address the estimation of the sensitivity indices called "Shapley eects". These sensitivity indices enable to handle dependent input variables. The Shapley eects are generally dicult to estimate, but they are easily computable in the Gaussian linear framework. The aim of this work is to use the values of the Shapley eects in an approximated Gaussian linear framework as estimators of the true Shapley eects corresponding to a non-linear model. First, we assume that the input variables are Gaussian with small variances. We provide rates of convergence of the estimated Shapley eects to the true Shapley eects. Then, we focus on the case where the inputs are given by an non-Gaussian empirical mean. We prove that, under some mild assumptions, when the number of terms in the empirical mean increases, the dierence between the true Shapley eects and the estimated Shapley eects given by the Gaussian linear approximation converges to 0. Our theoretical results are supported by numerical studies, showing that the Gaussian linear approximation is accurate and enables to decrease the computational time signicantly.

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