Classification in postural style

Abstract : This article contributes to the search for a notion of postural style, focusing on the issue of classifying subjects in terms of how they maintain posture. Longer term, the hope is to make it possible to determine on a case by case basis which sensorial information is prevalent in postural control, and to improve/adapt protocols for functional rehabilitation among those who show deficits in maintaining posture, typically seniors. Here, we specifically tackle the statistical problem of classifying subjects sampled from a two-class population. Each subject (enrolled in a cohort of 54 participants) undergoes four experimental protocols which are designed to evaluate potential deficits in maintaining posture. This results in four complex trajectories, from which we decide to extract four small-dimensional summary measures. Because undergoing several protocols is at least unpleasant, and sometimes painful, we try to limit the number of protocols needed for the classification. Therefore, we first rank the protocols by decreasing order of relevance, then we derive four plug-in classifiers which involve the best (i.e., more informative), the two best, the three best and all four protocols. This two-step procedure relies on the cutting-edge methodologies of targeted maximum likelihood learning (a novel methodology for robust and efficient estimation and testing) and super-learning (a machine learning procedure for aggregating various estimation procedures into a single better estimation procedure). A simulation study is carried out. The performances of the procedure applied to the real dataset (and evaluated by the leave-one-out rule) go as high as a 87% rate of correct classification (47 out of 54 subjects correctly classified), using only the best protocol.
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Annals Of Applied Statistics, Institute Mathematical Statistics, 2012
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https://hal.archives-ouvertes.fr/hal-00576070
Contributeur : Christophe Denis <>
Soumis le : vendredi 11 mars 2011 - 19:11:16
Dernière modification le : mardi 11 octobre 2016 - 14:21:56
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  • HAL Id : hal-00576070, version 1

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Antoine Chambaz, Christophe Denis. Classification in postural style. Annals Of Applied Statistics, Institute Mathematical Statistics, 2012. <hal-00576070>

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