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Monge-Kantorovich Depth, Quantiles, Ranks, and Signs

Author

Listed:
  • Victor Chernozhukov

    (Department of Economics (Massachusetts University of Technology) (MIT))

  • Alfred Galichon

    (Département d'économie (ECON))

  • Marc Hallin

    (Université Libre de Bruxelles)

  • Marc Henry

    (Département de sciences économiques (Université de Montréal))

Abstract

We propose new concepts of statistical depth, multivariate quantiles, vector quantiles and ranks, ranks and signs, based on canonical transportation maps between a distribution of interest on Rd and a reference distribution on the d-dimensional unit ball. The new depth concept, called Monge–Kantorovich depth, specializes to halfspace depth for d = 1 and in the case of spherical distributions, but for more general distributions, differs from the latter in the ability for its contours to account for non-convex features of the distribution of interest. We propose empirical counterparts to the population versions of those Monge–Kantorovich depth contours, quantiles, ranks, signs and vector quantiles and ranks, and show their consistency by establishing a uniform convergence property for empirical (forward and reverse) transport maps, which is the main theoretical result of this paper.

Suggested Citation

  • Victor Chernozhukov & Alfred Galichon & Marc Hallin & Marc Henry, 2017. "Monge-Kantorovich Depth, Quantiles, Ranks, and Signs," Sciences Po publications info:hdl:2441/64itsev5509, Sciences Po.
  • Handle: RePEc:spo:wpmain:info:hdl:2441/64itsev5509q8aa5mrbhi0g0b6
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    References listed on IDEAS

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