Mathematics – Probability
Scientific paper
2009-11-29
http://dx.doi.org/10.1016/j.spa.2010.03.005
Mathematics
Probability
Theorems 2 and 3 were restated and merged into one theorem; a new lemma (Lemma 1) added; Lemma 3 and Remark 1 were restated an
Scientific paper
10.1016/j.spa.2010.03.005
Let $S_n$ be a centered random walk with a finite variance, and define the new sequence $A_n:=\sum_{i=1}^n S_i$, which we call an integrated random walk. We are interested in the asymptotics of $$p_N:=P(\min_{1 \le k \le N} A_k \ge 0)$$ as $N \to \infty$. Sinai (1992) proved that $p_N \asymp N^{-1/4}$ if $S_n$ is a simple random walk. We show that $p_N \asymp N^{-1/4}$ for some other types of random walks that include double-sided exponential and double-sided geometric walks, both not necessarily symmetric. We also prove that $p_N \le c N^{-1/4}$ for lattice walks and for upper exponential walks, that are the walks such that $Law (S_1 | S_1>0)$ is an exponential distribution.
No associations
LandOfFree
On the probability that integrated random walks stay positive does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the probability that integrated random walks stay positive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the probability that integrated random walks stay positive will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-150829