Abstract
A global sensitivity analysis of complex computer codes is usually performed by calculating the Sobol indices. The indices are estimated using Monte Carlo methods. The Monte Carlo simulations are time-consuming even if the computer response is replaced by a metamodel. This paper proposes a new method for calculating sensitivity indices that overcomes the Monte Carlo estimation. The method assumes a discretization of the domain of simulation and uses the expansion of the computer response on an orthogonal basis of complex functions to built a metamodel. This metamodel is then used to derive an analytical estimation of the Sobol indices. This approach is successfully tested on analytical functions and is compared with two alternative methods.
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Jourdan, A. Global sensitivity analysis using complex linear models. Stat Comput 22, 823–831 (2012). https://doi.org/10.1007/s11222-011-9239-y
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DOI: https://doi.org/10.1007/s11222-011-9239-y