Random Walks Whose Concave Majorants Often Have Few Faces

Loading...
Thumbnail Image
Penn collection
Statistics Papers
Degree type
Discipline
Subject
Spitzer's combinatorial lemma
Random walk
Convex hull
Convex minorant
Concave majorant
Business
Statistics and Probability
Funder
Grant number
License
Copyright date
Distributor
Related resources
Author
Qiao, Zhihua
Steele, J Michael
Contributor
Abstract

We construct a continuous distribution G such that the number of faces in the smallest concave majorant of the random walk with G-distributed summands will take on each natural number infinitely often with probability one. This investigation is motivated by the fact that the number of faces Fn of the concave majorant of the random walk at time n has the same distribution as the number of records Rn in the sequence of summands up to time n. Since Rn is almost surely asymptotic to log n, the construction shows that despite the equality of all of the one-dimensional marginals, the almost sure behaviors of the sequences { Rn } and { Fn } may be radically different.

Advisor
Date Range for Data Collection (Start Date)
Date Range for Data Collection (End Date)
Digital Object Identifier
Series name and number
Publication date
2005-11-15
Journal title
Statistics & Probability Letters
Volume number
Issue number
Publisher
Publisher DOI
Journal Issue
Comments
Recommended citation
Collection