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Transactions of the American Mathematical Society

Published by the American Mathematical Society since 1900, Transactions of the American Mathematical Society is devoted to longer research articles in all areas of pure and applied mathematics.

ISSN 1088-6850 (online) ISSN 0002-9947 (print)

The 2020 MCQ for Transactions of the American Mathematical Society is 1.48.

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Sharp connections between Berry-Esseen characteristics and Edgeworth expansions for stationary processes
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by Moritz Jirak, Wei Biao Wu and Ou Zhao PDF
Trans. Amer. Math. Soc. 374 (2021), 4129-4183 Request permission

Abstract:

Given a weakly dependent stationary process, we describe the transition between a Berry-Esseen bound and a second order Edgeworth expansion in terms of the Berry-Esseen characteristic. This characteristic is sharp: We show that Edgeworth expansions are valid if and only if the Berry-Esseen characteristic is of a certain magnitude. If this is not the case, we still get an optimal Berry-Esseen bound, thus describing the exact transition. We also obtain (fractional) expansions given $3 < p \leq 4$ moments, where a similar transition occurs. Corresponding results also hold for the Wasserstein metric $W_1$, where a related, integrated characteristic turns out to be optimal. As an application, we establish novel weak Edgeworth expansion and CLTs in $L^p$ and $W_1$. As another application, we show that a large class of high dimensional linear statistics admits Edgeworth expansions without any smoothness constraints, that is, no non-lattice condition or related is necessary. In all results, the necessary weak-dependence assumptions are very mild. In particular, we show that many prominent dynamical systems and models from time series analysis are within our framework, giving rise to many new results in these areas.
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Additional Information
  • Moritz Jirak
  • Affiliation: Department of Statistics and Operations Research, University of Vienna, Oskar Morgenstern Platz 1, 1090 Vienna, Austria
  • MR Author ID: 926986
  • Email: moritz.jirak@univie.ac.at
  • Wei Biao Wu
  • Affiliation: Department of Statistics, University of Chicago, 5747 S Ellis Ave, Chicago, Illinois 60637
  • MR Author ID: 652125
  • Email: wbwu@galton.uchicago.edu
  • Ou Zhao
  • Affiliation: Loxo Oncology at Lilly, 701 Gateway Blvd. Suite 420, South San Francisco, California 94080
  • MR Author ID: 827874
  • Email: ozhao@loxooncology.com
  • Received by editor(s): December 14, 2019
  • Received by editor(s) in revised form: September 15, 2020
  • Published electronically: March 19, 2021
  • © Copyright 2021 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 374 (2021), 4129-4183
  • MSC (2020): Primary 60F05, 60F25; Secondary 60G10
  • DOI: https://doi.org/10.1090/tran/8328
  • MathSciNet review: 4251225