Mixed random beta-polytopes

T. D. Moseeva

Zapiski Nauchnykh Seminarov POMI, Probability and statistics. Part 36, Tome 535 (2024), pp. 189-199

Résumé

In this paper, we generalize the result on the average volume of random polytopes with vertices following beta distributions to the case of non-identically distributed vectors. Specifically,we consider the convex hull of independent random vectors in $\mathbb{R}^d$, where each vector follows a beta distribution with potentially different parameters. We derive an expression for the expected volume of these generalized beta–polytopes. Additionally, we compute the expected value of a functional introduced by Wieacker, which involves the distance of facets from the origin and their volumes. Our results extend those of Kabluchko, Temesvari, and Thäle. Key techniques used in the proofs include the Blaschke–Petkantschin formula, \break Kubota's formula, and projections of beta distributed random vectors.