Depth for Curve Data and Applications - Ensai, Ecole Nationale de la Statistique et de l'Analyse de l'Information
Journal Articles Journal of the American Statistical Association Year : 2021

Depth for Curve Data and Applications

Abstract

In 1975, John W. Tukey defined statistical data depth as a function that determines the centrality of an arbitrary point with respect to a data cloud or to a probability measure. During the last decades, this seminal idea of data depth evolved into a powerful tool proving to be useful in various fields of science. Recently, extending the notion of data depth to the functional setting attracted a lot of attention among theoretical and applied statisticians. We go further and suggest a notion of data depth suitable for data represented as curves, or trajectories, which is independent of the parameterization. We show that our curve depth satisfies theoretical requirements of general depth functions that are meaningful for trajectories. We apply our methodology to diffusion tensor brain images and also to pattern recognition of handwritten digits and letters. Supplementary materials for this article are available online.
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Dates and versions

hal-03188029 , version 1 (19-07-2024)

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Pierre Lafaye de Micheaux, Pavlo Mozharovskyi, Myriam Vimond. Depth for Curve Data and Applications. Journal of the American Statistical Association, 2021, 116 (536), pp.1881-1897. ⟨10.1080/01621459.2020.1745815⟩. ⟨hal-03188029⟩
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