Department of Economics, Boston University, 270 Bay State Rd., Boston, MA, 02215. e-mail:;


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  • I received the distinction of “Doctor Honoris Causa” from the Pontificia Universidad Católica del Perú (Lima,  Perú) during a ceremony held September 8, 2023 at Boston University. You can learn more from the University Council Resolution and the very touching and beautiful speech by Professor Gabriel Rodríguez. I am very honored and wish to thank both the University Council and Professor Rodríguez. The official doctorate certificate is absolutely beautiful and a medal was also given. I am deeply grateful.
  • The Biometrika (1988) paper crossed 25,000 cites in April 2023.
  • Distinguished Author Award 2022; Journal of Time Series Analysis.
  • Co-author (and academic grandson) Xuewen Yu wins the 2021 Denis Sargan Econometrics Prize.
  • The 1989 Econometrica paper “The Great Crash, the Oil Price Shock and the Unit Root Hypothesis,” crossed the 10,000 number of Google cites end-December 2021.
  • A special issue of the Journal of Econometrics (224, 1, 2021) was published as a follow-up to the pi-day conference held at Boston University on 3/14/2019 to celebrate my 60th birthday with former and current students, colleagues, co-authors and some friends. A nice introduction and eleven papers were included in the issue. My sincere thanks to the Board of the Journal of Econometrics, the contributors and the guests editors: Serena Ng, Zhongjun Qu and Tim Vogelsang.

Recently published:

  • “Forecasting in the Presence of In and Out of Sample Breaks,” (with Jiawen Xu), Empirical Economics 64 (2023), 3001-3035.
  • Simultaneous Bandwidths Determination for DK-HAC Estimators and Long-Run Variance Estimation in Nonparametric Settings” (with Federico Belotti, Alessandro Casini, Leopoldo Catania, Stefano Grassi), Econometric Reviews 42 (2023), 281-306.
  • Anthropogenic influence on global increase in extreme heat and precipitation with implications for risk hotspots,” (with Francisco Estrada and Yohei Yamamoto), Scientific Reports 13 (2023), Article number: 35.

Selected as a 2020 Clarivate Citation Laureate for the statistical analysis of non-stationary time series. Intended for researchers whose work is deemed to be ‘of Nobel class’, as demonstrated by analysis carried out by the Institute for Scientific Information™ (ISI). For the announcement,—annual-list-of-researchers-of-nobel-class-301136248.html

    For the main web page see:

    Citation Laureates 2020 – Economics

    For interviews and some thoughts:

    • Former PhD student and co-author Alessandro Casini won an “honorable mention” for the 2020 Arnold Zellner thesis award. Congratulations!  (
    • A special conference was held on March 14-15, 2019, at Boston University, the pi-day conference, to celebrate my 60th birthday with former and current students, colleagues, co-authors and some friends. A proceeding is planned as a special issue of the Journal of Econometrics. Special thanks to the Department of Economics and IED at Boston University for help in funding this event, and, of course, to the participants. The program is available here. Special thanks to Zhongjun Qu for organizing  this memorable event.
    • A collection of papers I wrote over my career (one never published) was published in two volumes (20 papers each) by World Scientific; each with an introduction putting the work in some historical context and linking the papers together:

    Time Series Econometrics: Volume 1: Unit Roots and Trend Breaks, (Perron, P., ed.), World Scientific, 2019, 743 pages.
    Time Series Econometrics: Volume 2: Structural Change, (Perron, P., ed.), World Scientific, 2019, 948 pages.

    They are also available as a set and on Amazon.