Convex geometry of max-stable distributions

Details Convex geometry of max-stable distributions Convex geometry of max-stable distributions

2006-03-17

arxiv.org/abs/math/0603423v3

Mathematics

Probability

25 pages. Revised version

Scientific paper

It is shown that max-stable random vectors in $[0,\infty)^d$ with unit Fr\'echet marginals are in one to one correspondence with convex sets $K$ in $[0,\infty)^d$ called max-zonoids. The max-zonoids can be characterised as sets obtained as limits of Minkowski sums of cross-polytopes or, alternatively, as the selection expectation of a random cross-polytope whose distribution is controlled by the spectral measure of the max-stable random vector. Furthermore, the cumulative distribution function $\Prob{\xi\leq x}$ of a max-stable random vector $\xi$ with unit Fr\'echet marginals is determined by the norm of the inverse to $x$, where all possible norms are given by the support functions of max-zonoids. As an application, geometrical interpretations of a number of well-known concepts from the theory of multivariate extreme values and copulas are provided. The convex geometry approach makes it possible to introduce new operations with max-stable random vectors.

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