ADAPTIVE DECONVOLUTION OF LINEAR FUNCTIONALS ON THE NONNEGATIVE REAL LINE

International audienceIn this paper we consider the convolution model Z = X + Y with X of unknown density f , independent of Y , when both random variables are nonnegative. Our goal is to estimate linear functionals of f such as f for a known function ψ assuming that the distribution of Y is known and only Z is observed. We propose an estimator of f based on a projection estimator of f on Laguerre spaces, present upper bounds on the quadratic risk and derive the rate of convergence in function of the smoothness of f, g and ψ. Then we propose a nonparametric data driven strategy, inspired Goldenshluger and Lepski (2011) method to select a relevant projection space. This methodology is then adapted to pointwise estimation of f. We illustrate the good performance of the new method through simulations. We also test a new approach for choosing the tuning parameter in Goldenshluger-Lepski data driven estimators following ideas developed in Lacour and Massart (2015)