arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1303.4372stat.AP
收藏

因变量的广义Sobol敏感性指数:数值方法

Generalized Sobol sensitivity indices for dependent variables: numerical methods

Gaelle Chastaing, Clémentine Prieur, Fabrice Gamboa

摘要:

本文讨论了随机向量X=(X_1,.,X_p)是将f(X)分解为只依赖于X的一个子向量的增维函数之和。即使当X_1,.,X_p是相依的,如果分量是层次正交的,则分解是唯一的.也就是说,只要其中一个被加数中涉及的所有变量是另一个被加数中涉及的变量的子集,其中两个分量就是正交的。设置Y=f(X),该分解导致能够量化Y相对于相关输入X的不确定性的广义灵敏度指数的定义。本文提出了一种利用层次正交性识别分解的分量函数的数值方法。此外,研究了分量估计的渐近性质,以及玩具模型的广义灵敏度指标的数值估计。最后,该方法被应用到一个模型所产生的现实世界的问题。

英文摘要:

The hierarchically orthogonal functional decomposition of any measurable function f of a random vector X=(X_1,...,X_p) consists in decomposing f(X) into a sum of increasing dimension functions depending only on a subvector of X. Even when X_1,..., X_p are assumed to be dependent, this decomposition is unique if components are hierarchically orthogonal. That is, two of the components are orthogonal whenever all the variables involved in one of the summands are a subset of the variables involved in the other. Setting Y=f(X), this decomposition leads to the definition of generalized sensitivity indices able to quantify the uncertainty of Y with respect to the dependent inputs X. In this paper, a numerical method is developed to identify the component functions of the decomposition using the hierarchical orthogonality property. Furthermore, the asymptotic properties of the components estimation is studied, as well as the numerical estimation of the generalized sensitivity indices of a toy model. Lastly, the method is applied to a model arising from a real-world problem.

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。

↑