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Multivariate quantiles and multiple-output regression quantiles: from L1 optimization to halfspace depth

Marc Hallin (), Davy Paindaveine () and Miroslav Siman

No 2008_042, Working Papers ECARES from ULB -- Universite Libre de Bruxelles

Abstract: A new multivariate concept of quantile, based on a directional version of Koenker and Bassett’s traditional regression quantiles, is introduced for multivariate location and multiple-output regression problems. In their empirical version, those quantiles can be computed efficiently via linear programming techniques. Consistency, Bahadur representation and asymptotic normality results are established. Most importantly, the contours generated by those quantiles are shown to coincide with the classical halfspace depth contours associated with the name of Tukey. This relation does not only allow for efficient depth contour computations by means of parametric linear programming, but also for transferring from the quantile to the depth universe such asymptotic results as Bahadur representations. Finally, linear programming duality opens the way to promising developments in depth-related multivariate rank-based inference.

New Economics Papers: this item is included in nep-ecm and nep-fdg
Date: 2008
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Published by: ECARES

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Working Paper: Multivariate quantiles and multiple-output regression quantiles: From L1 optimization to halfspace depth (2010)
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