Variable selection in model-based clustering using multilocus genotype data

We propose a variable selection procedure in model-based clustering using multilocus genotype data. Indeed, it may happen that some loci are not relevant for clustering into statistically different populations. Inferring the number K of clusters and the relevant clustering subset S of loci is seen as a model selection problem. The competing models are compared using penalized maximum likelihood criteria. Under weak assumptions on the penalty function, we prove the consistency of the resulting estimator ${(widehat{K}_n, widehat{S}_n)}$ . An associated algorithm named Mixture Model for Genotype Data (MixMoGenD) has been implemented using c++ programming language and is available on http://www.math.u-psud.fr/~toussile. To avoid an exhaustive search of the optimum model, we propose a modified Backward-Stepwise algorithm, which enables a better search of the optimum model among all possible cardinalities of S. We present numerical experiments on simulated and real datasets that highlight the interest of our loci selection procedure.