TY - JOUR
T1 - Asymptotic expected number of passages of a random walk through an interval
AU - Kella, Offer
AU - Stadje, Wolfgang
PY - 2013/3
Y1 - 2013/3
N2 - In this note we find a new result concerning the asymptotic expected number of passages of a finite or infinite interval (x, x + h] as x →∞for a random walk with increments having a positive expected value. If the increments are distributed like X then the limit for 0 < h < ∞ turns out to have the form Emin(|X|, h)/EX, which unexpectedly is independent of h for the special case where |X| ≤ b < ∞ almost surely and h > b. When h = ∞, the limit is Emax(X, 0)/EX. For the case of a simple random walk, a more pedestrian derivation of the limit is given.
AB - In this note we find a new result concerning the asymptotic expected number of passages of a finite or infinite interval (x, x + h] as x →∞for a random walk with increments having a positive expected value. If the increments are distributed like X then the limit for 0 < h < ∞ turns out to have the form Emin(|X|, h)/EX, which unexpectedly is independent of h for the special case where |X| ≤ b < ∞ almost surely and h > b. When h = ∞, the limit is Emax(X, 0)/EX. For the case of a simple random walk, a more pedestrian derivation of the limit is given.
KW - Generalized renewal theorem
KW - Passage
KW - Random walk
KW - Two-sided renewal theorem
UR - http://www.scopus.com/inward/record.url?scp=84879116286&partnerID=8YFLogxK
U2 - 10.1239/jap/1363784439
DO - 10.1239/jap/1363784439
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AN - SCOPUS:84879116286
SN - 0021-9002
VL - 50
SP - 288
EP - 294
JO - Journal of Applied Probability
JF - Journal of Applied Probability
IS - 1
ER -