Sharp error terms for return time statistics under mixing conditions

Details Sharp error terms for return time statistics under mixing conditions Sharp error terms for return time statistics under mixing conditions

2008-12-04

arxiv.org/abs/0812.1016v1

Mathematics

Probability

Scientific paper

10.1007/s10959-008-0199-x

We describe the statistics of repetition times of a string of symbols in a stochastic process. Denote by T(A) the time elapsed until the process spells the finite string A and by S(A) the number of consecutive repetitions of A. We prove that, if the length of the string grows unbondedly, (1) the distribution of T(A), when the process starts with A, is well aproximated by a certain mixture of the point measure at the origin and an exponential law, and (2) S(A) is approximately geometrically distributed. We provide sharp error terms for each of these approximations. The errors we obtain are point-wise and allow to get also approximations for all the moments of T(A) and S(A). To obtain (1) we assume that the process is phi-mixing while to obtain (2) we assume the convergence of certain contidional probabilities.

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