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hal-00665048, version 1

Asymptotic normality and efficiency of two Sobol index estimators

Alexandre Janon () a12, Thierry Klein () 3, Agnes Lagnoux-Renaudie (, http://www.math.univ-toulouse.fr/~lagnoux) 3, Maëlle Nodet () a1, Clémentine Prieur () a12

Abstract: Many mathematical models involve input parameters, which are not precisely known. Global sensitivity analysis aims to identify the parameters whose uncertainty has the largest impact on the variability of a quantity of interest (output of the model). One of the statistical tools used to quantify the influence of each input variable on the output is the Sobol sensitivity index. We consider the statistical estimation of this index from a finite sample of model outputs: we present two estimators and state a central limit theorem for each. We show that one of these estimators has an optimal asymptotic variance. We also generalize our results to the case where the true output is not observable, and is replaced by a noisy version.

  • Domain : Mathematics/Statistics
    Statistics/Applications
    Statistics/Statistics Theory
    Statistics/Computation
  • Keywords : sensitivity analysis – Sobol index – asymptotic normality – asymptotic efficiency – nonparametric Cramér-Rao bound – metamodel – response surface method – Kriging
 
  • hal-00665048, version 1
  • oai:hal.inria.fr:hal-00665048
  • From: 
  • Submitted on: Wednesday, 1 February 2012 10:32:48
  • Updated on: Wednesday, 15 February 2012 15:16:05
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