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Exploring the latent segmentation space for the assessment of multiple change-point models

Yann Guédon 1, 2 
2 VIRTUAL PLANTS - Modeling plant morphogenesis at different scales, from genes to phenotype
CRISAM - Inria Sophia Antipolis - Méditerranée , INRA - Institut National de la Recherche Agronomique, UMR AGAP - Amélioration génétique et adaptation des plantes méditerranéennes et tropicales
Abstract : This paper addresses the retrospective or off-line multiple change-point detection problem. Multiple change-point models are here viewed as latent structure models and the focus is on inference concerning the latent segmentation space. Methods for exploring the space of possible segmentations of a sequence for a fixed number of change points may be divided into two categories: (i) enumeration of segmentations, (ii) summary of the possible segmentations in change-point or segment profiles. Concerning the first category, a dynamic programming algorithm for computing the top \$N\$ N most probable segmentations is derived. Concerning the second category, a forward-backward dynamic programming algorithm and a smoothing-type forward-backward algorithm for computing two types of change-point and segment profiles are derived. The proposed methods are mainly useful for exploring the segmentation space for successive numbers of change points and provide a set of assessment tools for multiple change-point models that can be applied both in a non-Bayesian and a Bayesian framework. We show using examples that the proposed methods may help to compare alternative multiple change-point models (e.g. Gaussian model with piecewise constant variances or global variance), predict supplementary change points, highlight overestimation of the number of change points and summarize the uncertainty concerning the position of change points.
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Contributor : Christophe Godin Connect in order to contact the contributor
Submitted on : Friday, August 9, 2013 - 10:46:58 AM
Last modification on : Thursday, March 24, 2022 - 3:37:08 AM

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Yann Guédon. Exploring the latent segmentation space for the assessment of multiple change-point models. Computational Statistics, Springer Verlag, 2013, pp.1-38. ⟨10.1007/s00180-013-0422-9⟩. ⟨hal-00850847⟩



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