中国物理B ›› 2023, Vol. 32 ›› Issue (10): 100505-100505.doi: 10.1088/1674-1056/acd62b

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Visibility graph approach to extreme event series

Jing Zhang(张晶)1,2, Xiaolu Chen(陈晓露)1, Haiying Wang(王海英)1, Changgui Gu(顾长贵)1, and Huijie Yang(杨会杰)1,†   

  1. 1 Department of Systems Science, University of Shanghai for Science and Technology, Shanghai 200093, China;
    2 Department of Business, Wuxi Taihu University, Wuxi 214064, China
  • 收稿日期:2023-03-25 修回日期:2023-05-12 接受日期:2023-05-17 出版日期:2023-09-21 发布日期:2023-10-08
  • 通讯作者: Huijie Yang E-mail:hjyang@ustc.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11805128, 11875042, and 11505114) and the Shanghai Project for Construction of Top Disciplines, China (Grant No. USST-SYSBIO).

Visibility graph approach to extreme event series

Jing Zhang(张晶)1,2, Xiaolu Chen(陈晓露)1, Haiying Wang(王海英)1, Changgui Gu(顾长贵)1, and Huijie Yang(杨会杰)1,†   

  1. 1 Department of Systems Science, University of Shanghai for Science and Technology, Shanghai 200093, China;
    2 Department of Business, Wuxi Taihu University, Wuxi 214064, China
  • Received:2023-03-25 Revised:2023-05-12 Accepted:2023-05-17 Online:2023-09-21 Published:2023-10-08
  • Contact: Huijie Yang E-mail:hjyang@ustc.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11805128, 11875042, and 11505114) and the Shanghai Project for Construction of Top Disciplines, China (Grant No. USST-SYSBIO).

摘要: An extreme event may lead to serious disaster to a complex system. In an extreme event series there exist generally non-trivial patterns covering different time scales. Investigations on extreme events are currently based upon statistics, where the patterns are merged into averages. In this paper from extreme event series we constructed extreme value series and extreme interval series. And the visibility graph is then adopted to display the patterns formed by the increases/decreases of extreme value or interval faster/slower than the linear ones. For the fractional Brownian motions, the properties for the constructed networks are the persistence, threshold, and event-type-independent, $e.g.$, the degree distributions decay exponentially with almost identical speeds, the nodes cluster into modular structures with large and similar modularity degrees, and each specific network has a perfect hierarchical structure. For the volatilities of four stock markets (NSDQ, SZI, FTSE100, and HSI), the properties for the former three's networks are threshold- and market-independent. Comparing with the factional Brownian motions, their degree distributions decay exponentially but with slower speeds, their modularity behaviors are significant but with smaller modularity degrees. The fourth market behaves similar qualitatively but different quantitatively with the three markets. Interestingly, all the transition frequency networks share an identical backbone composed of nine edges and the linked graphlets. The universal behaviors give us a framework to describe extreme events from the viewpoint of network.

关键词: extreme events, visibility graph

Abstract: An extreme event may lead to serious disaster to a complex system. In an extreme event series there exist generally non-trivial patterns covering different time scales. Investigations on extreme events are currently based upon statistics, where the patterns are merged into averages. In this paper from extreme event series we constructed extreme value series and extreme interval series. And the visibility graph is then adopted to display the patterns formed by the increases/decreases of extreme value or interval faster/slower than the linear ones. For the fractional Brownian motions, the properties for the constructed networks are the persistence, threshold, and event-type-independent, $e.g.$, the degree distributions decay exponentially with almost identical speeds, the nodes cluster into modular structures with large and similar modularity degrees, and each specific network has a perfect hierarchical structure. For the volatilities of four stock markets (NSDQ, SZI, FTSE100, and HSI), the properties for the former three's networks are threshold- and market-independent. Comparing with the factional Brownian motions, their degree distributions decay exponentially but with slower speeds, their modularity behaviors are significant but with smaller modularity degrees. The fourth market behaves similar qualitatively but different quantitatively with the three markets. Interestingly, all the transition frequency networks share an identical backbone composed of nine edges and the linked graphlets. The universal behaviors give us a framework to describe extreme events from the viewpoint of network.

Key words: extreme events, visibility graph

中图分类号:  (Time series analysis)

  • 05.45.Tp
89.65.Gh (Economics; econophysics, financial markets, business and management)