Gambler's Ruin and the First Exit Position of Random Walk from Large Spheres
Griffin, Philip S. ; McConnell, Terry R.
Ann. Probab., Tome 22 (1994) no. 4, p. 1429-1472 / Harvested from Project Euclid
Let $T_r$ be the first time a sum $S_n$ of nondegenerate i.i.d. random vectors in $\mathbb{R}^d$ leaves the sphere of radius $r$ in some given norm. We characterize, in terms of the distribution of the individual summands, the following probabilistic behavior: $S_{T_r}/\|S_{T_r}\|$ has no subsequential weak limit supported on a closed half-space. In one dimension, this result solves a very general form of the gambler's ruin problem. We also characterize the existence of degenerate limits and obtain analogous results for triangular arrays along any subsequence $r_k \rightarrow \infty$. Finally, we compute the limiting joint distribution of $(\|S_{T_r}\| - r, S_{T_r}/\|S_{T_r}\|)$.
Publié le : 1994-07-14
Classification:  Random walk,  multidimensional renewal theory,  overshoot,  gambler's ruin,  60J15,  60G50,  60K05
@article{1176988608,
     author = {Griffin, Philip S. and McConnell, Terry R.},
     title = {Gambler's Ruin and the First Exit Position of Random Walk from Large Spheres},
     journal = {Ann. Probab.},
     volume = {22},
     number = {4},
     year = {1994},
     pages = { 1429-1472},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1176988608}
}
Griffin, Philip S.; McConnell, Terry R. Gambler's Ruin and the First Exit Position of Random Walk from Large Spheres. Ann. Probab., Tome 22 (1994) no. 4, pp.  1429-1472. http://gdmltest.u-ga.fr/item/1176988608/