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Enclosing Depth and Other Depth Measures

Author Patrick Schnider

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Author Details

Patrick Schnider
  • Department of Mathematical Sciences, University of Copenhagen, Denmark

Funding

The author has received funding from the European Research Council under the European Unions Seventh Framework Programme ERC Grant agreement ERC StG 716424 - CASe.

Acknowledgements

Thanks to Emo Welzl, Karim Adiprasito and Uli Wagner for the helpful discussions.

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Patrick Schnider. Enclosing Depth and Other Depth Measures. In 32nd International Symposium on Algorithms and Computation (ISAAC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 212, pp. 10:1-10:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.ISAAC.2021.10

Abstract

We study families of depth measures defined by natural sets of axioms. We show that any such depth measure is a constant factor approximation of Tukey depth. We further investigate the dimensions of depth regions, showing that the Cascade conjecture, introduced by Kalai for Tverberg depth, holds for all depth measures which satisfy our most restrictive set of axioms, which includes Tukey depth. Along the way, we introduce and study a new depth measure called enclosing depth, which we believe to be of independent interest, and show its relation to a constant-fraction Radon theorem on certain two-colored point sets.

Subject Classification

ACM Subject Classification
  • Theory of computation → Computational geometry
Keywords
  • Depth measures
  • Tukey depth
  • Tverberg theorem
  • Combinatorial Geometry

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