Constructing processes with prescribed mixing coefficients

Details Constructing processes with prescribed mixing coefficients Constructing processes with prescribed mixing coefficients

2007-11-07

arxiv.org/abs/0711.0986v1

Mathematics

Probability

10 pages

Scientific paper

The rate at which dependencies between future and past observations decay in a random process may be quantified in terms of mixing coefficients. The latter in turn appear in strong laws of large numbers and concentration of measure results for dependent random variables. Questions regarding what rates are possible for various notions of mixing have been posed since the 1960's, and have important implications for some open problems in the theory of strong mixing conditions. This paper deals with $\eta$-mixing, a notion defined in [Kontorovich and Ramanan], which is closely related to $\phi$-mixing. We show that there exist measures on finite sequences with essentially arbitrary $\eta$-mixing coefficients, as well as processes with arbitrarily slow mixing rates.

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