English

A phase transition for the probability of being a maximum among random vectors with general iid coordinates

Probability 2023-02-20 v2 Statistics Theory Statistics Theory

Abstract

Consider nn iid real-valued random vectors of size kk having iid coordinates with a general distribution function FF. A vector is a maximum if and only if there is no other vector in the sample which weakly dominates it in all coordinates. Let pk,np_{k,n} be the probability that the first vector is a maximum. The main result of the present paper is that if kknk\equiv k_n is growing at a slower (faster) rate than a certain factor of log(n)\log(n), then pk,n0p_{k,n} \rightarrow 0 (resp. pk,n1p_{k,n}\rightarrow1) as nn\to\infty. Furthermore, the factor is fully characterized as a functional of FF. We also study the effect of FF on pk,np_{k,n}, showing that while pk,np_{k,n} may be highly affected by the choice of FF, the phase transition is the same for all distribution functions up to a constant factor.

Keywords

Cite

@article{arxiv.2112.15534,
  title  = {A phase transition for the probability of being a maximum among random vectors with general iid coordinates},
  author = {Royi Jacobovic and Or Zuk},
  journal= {arXiv preprint arXiv:2112.15534},
  year   = {2023}
}

Comments

17 pages, 1 figure