Semiparametric mixtures of symmetric distributions

Details Semiparametric mixtures of symmetric distributions Semiparametric mixtures of symmetric distributions

2011-11-09

arxiv.org/abs/1111.2247v1

Mathematics

Statistics Theory

Scientific paper

We consider in this paper the semiparametric mixture of two distributions equal up to a shift parameter. The model is said to be semiparametric in the sense that the mixed distribution is not supposed to belong to a parametric family. In order to insure the identifiability of the model it is assumed that the mixed distribution is symmetric, the model being then defined by the mixing proportion, two location parameters, and the probability density function of the mixed distribution. We propose a new class of M-estimators of these parameters based on a Fourier approach, and prove that they are square root consistent under mild regularity conditions. Their finite-sample properties are illustrated by a Monte Carlo study and a benchmark real dataset is also studied with our method.

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