Qualitative robustness of statistical functionals under strong mixing

Details Qualitative robustness of statistical functionals under strong mixing Qualitative robustness of statistical functionals under strong mixing

2012-03-23

arxiv.org/abs/1203.5245v1

Mathematics

Statistics Theory

Scientific paper

A new concept of qualitative robustness for plug-in estimators based on identically distributed possibly {\em dependent} observations is introduced, and it is shown that Hampel's theorem for general metrics $d$ still holds. Since Hampel's theorem assumes the UGC property w.r.t.\ $d$, i.e.\ convergence in probability of the empirical probability measure to the true marginal distribution w.r.t.\ $d$ uniformly in the class of all admissible laws on the sample path space, this property is shown for a large class of strongly mixing laws for three different metrics $d$. For real-valued observations the UGC property is established for both the Kolomogorov $\phi$-metric and the L\'evy $\psi$-metric, and for observations in a general locally compact and second countable Hausdorff space the UGC property is established for a certain metric generating the $\psi$-weak topology. The key is a new uniform weak LLN for strongly mixing random variables. The latter is of independent interest and relies on Rio's maximal inequality.

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