Efficient estimation of sensitivity indices

In this paper, we address the problem of efficient estimation of Sobol sensitivity indices. First, we focus on general functional integrals of conditional moments of the form ?((?(phi(Y)|X))) where (X, Y) is a random vector with joint density f and and phi are functions that are differentiable enough. In particular, we show that asymptotical efficient estimation of this functional boils down to the estimation of crossed quadratic functionals. An efficient estimate of first-order sensitivity indices is then derived as a special case. We investigate its properties on several analytical functions and illustrate its interest on a reservoir engineering case.