Section: New Results

Axis 1: Multiple partition clustering

Participant : Vincent Vandewalle.

In the framework of model-based clustering, a model allowing several latent class variables have been proposed. This model assumes that the distribution of the observed data can be factorized into several independent blocks of variables. Each block is assumed to follow a latent class model (i.e., mixture with conditional independence assumption). The proposed model includes variable selection, as a special case, and is able to cope with the mixed-data setting. The simplicity of the model allows to estimate the repartition of the variables into blocks and the mixture parameters simultaneously, thus avoiding running EM algorithms for each possible repartition of variables into blocks. For the proposed method, a model is defined by the number of blocks, the number of clusters inside each block and the repartition of variables into blocks. Model selection can be done with two information criteria, the BIC and the MICL, for which an efficient optimization is proposed. The proposed method gives a rich interpretation of the data set at hand (i.e., analysis of the repartition of the variables into blocks and analysis of the clusters produced by each block of variables). This work as been presented in several international conferences and is now published [20].

It is a joint work with Matthieu Marbac from ENSAI.