Positivity of integrated random walks
Probability
2012-03-19 v2
Abstract
Take a centered random walk S_n and consider the sequence of its partial sums A_n = S_1 + ... + S_n. Suppose S_1 is in the domain of normal attraction of an \alpha-stable law with 1 < \alpha <= 2. Assuming that S_1 is either right-exponential (that is P(S > x | S > 0)=e^{-ax} for some a > 0 and all x > 0) or right-continuous (skip free), we prove that p_N = P(A_1 > 0, ..., A_N > 0) ~ C_\alpha N^{1/(2\alpha) - 1/2} as N tends to infinity, where C_\alpha > 0 depends on the distribution of the walk. We also consider a conditional version of this problem and study positivity of integrated discrete bridges.
Cite
@article{arxiv.1107.4943,
title = {Positivity of integrated random walks},
author = {Vladislav Vysotsky},
journal= {arXiv preprint arXiv:1107.4943},
year = {2012}
}