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Sequential analysis for economic time series and its applications - Detection of financial bubbles

Research Project

Project/Area Number 19K21691
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 7:Economics, business administration, and related fields
Research InstitutionKyoto University

Principal Investigator

Nishiyama Yoshihiko  京都大学, 経済研究所, 教授 (30283378)

Co-Investigator(Kenkyū-buntansha) 人見 光太郎  京都工芸繊維大学, 基盤科学系, 教授 (00283680)
永井 圭二  横浜国立大学, 大学院国際社会科学研究院, 教授 (50311866)
Project Period (FY) 2019-06-28 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2020: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords逐次検定 / 単位根 / criticality / DDSブラウン運動 / ベッセル過程 / 時系列 / ラプラス変換 / 逐次解析 / 単位根検定 / 臨界性検定 / criticality test / 自己回帰モデル / 分枝過程 / 時系列モデル
Outline of Research at the Start

本研究は、経済時系列分析に逐次解析法を取り入れた統計解析法を構築することである。それにより、例えば金融バブルの発生を早期に検出する方法を確立することが可能になる。データ収集をやめる時点を停止時といい、本研究では自己回帰モデルについて、データの情報の量的指標であるフィッシャー情報量が一定水準Cに達した時点でサンプリングを止める停止時を考える。漸近論ではそのCを大きくする枠組みで、推定問題、単位根検定問題を取り扱い、それらの推定量や検定統計量と停止時の同時分布を導出する。検定問題では、帰無分布のみならず対立分布も導出する。応用例として、金融市場におけるバブルの早期検出が考えられる。

Outline of Final Research Achievements

A theoretical study of sequential tests in autoregressive models commonly used in economic time series analysis and Galton-Watson branching processes used to describe populations in epidemiology was conducted for the AR(1) and AR(p) models, with stop times based on observed Fisher information. Simultaneous limits of the sequential test statistic and stopping time for the unit root test in the sampling scheme were derived and characterised using Bessel processes driven by DDS Brownian motion. The statistical properties of the estimators of variance were also clarified. Simultaneous Laplace transformations and simultaneous density functions in the limit were also obtained under the null and local alternative hypotheses.

Academic Significance and Societal Importance of the Research Achievements

社会全体としては、提案されて手法をもちいることによって、リアルタイムにバブルの発生を検出することが可能になる。それにより、政府や金融機関がバブルの発生による社会的なコストや損失回避のための情報を得ることが可能である。学術的には、検定統計量と停止時の同時分布を解析的に求めることで、この分野の数理統計理論を大きく発展させた。それにより、期待値や分散を含めたモーメントの計算および分位点の導出が可能になった。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (21 results)

All 2023 2022 2021 2020 2019

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (18 results) (of which Int'l Joint Research: 7 results)

  • [Journal Article] Sequential test for a unit root in monitoring a p-th order autoregressive process2023

    • Author(s)
      Kohtaro Hitomi, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Journal Title

      Advances in Econometrics: Essays in Honor of Joon Y. Park

      Volume: - Pages: 115-153

    • DOI

      10.1108/s0731-90532023000045a004

    • ISBN
      9781837532094, 9781837532087
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Unit root tests considering initial values and a concise method for computing powers2022

    • Author(s)
      Kohtaro Hitomi, Jianwei Jin, Keiji Nagai, Yoshihiko Nishiyama and Junfan Tao
    • Journal Title

      KIER Discussion Paper Series

      Volume: 1084 Pages: 1-20

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Sequential test for a unit root in monitoring a p-th order autoregressive process2022

    • Author(s)
      Kohtaro Hitomi, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Journal Title

      Advances in Econometrics: Essays in Honor of Joon Y. Park

      Volume: 1 Pages: 1-31

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Unit root tests with initial values and a concise method for computing powers2023

    • Author(s)
      Kohtaro Hitomi, Jianwei Jin, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Organizer
      Kohtaro Hitomi, Jianwei Jin, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Related Report
      2022 Annual Research Report
  • [Presentation] Sequential criticality test for branching process with immigration2021

    • Author(s)
      Kohtaro Hitomi, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Organizer
      63rd ISI World Statistics Congress 2021 (ISI WSC 2021) (Online)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Sequential test for a unit root in monitoring a p-th order autoregressive process2021

    • Author(s)
      Kohtaro Hitomi, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Organizer
      2021 Japanese Economic Association Spring Meeting
    • Related Report
      2021 Research-status Report
  • [Presentation] Criticality test for branching processes with immigration2021

    • Author(s)
      Kohtaro Hitomi, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Organizer
      Japanese joint statistical meeting 2021
    • Related Report
      2021 Research-status Report
  • [Presentation] Time-changed method in non-ergodic autoregressive process and branching process2021

    • Author(s)
      Kohtaro Hitomi, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Organizer
      2021 Japanese Economic Association Autumn Meeting
    • Related Report
      2021 Research-status Report
  • [Presentation] Sequential Test for Unit Root in First Order Autoregressive Model2021

    • Author(s)
      Kohtaro Hitomi, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Organizer
      2021 Japanese Economic Association Autumn Meeting
    • Related Report
      2021 Research-status Report
  • [Presentation] Sequential Test for the Criticality of Branching Processes,2021

    • Author(s)
      Kohtaro Hitomi, Keiji Nagai, Yoshihiko Nishiyama, and Junfan Tao
    • Organizer
      2021 Japanese Economic Association Autumn Meeting
    • Related Report
      2021 Research-status Report
  • [Presentation] Sequential analysis on branching process with immigration with a stopping time based on the observed Fisher information2021

    • Author(s)
      K.Nagai, K. Hitomi, Y.Nishiyama, and J. Tao
    • Organizer
      関西計量経済学研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] Detection of a unit root in monitoring AR(p) process with combination of a sequential procedure and the augmented Dickey-Fuller test2021

    • Author(s)
      K.Nagai, K. Hitomi, Y.Nishiyama, and J. Tao
    • Organizer
      関西計量経済学研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] Operating characteristics of sequential unit root tests obtained from the Bessel bridges2020

    • Author(s)
      K.Nagai, Y.Nishiyama, K. Hitomi, and J. Tao.
    • Organizer
      Bernoulli-IMS One World Symposium
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] The role of Bessel processes on the sequential test for a unit root in autoregressive process and criticality in branching processes2020

    • Author(s)
      K.Nagai, K. Hitomi, Y.Nishiyama and J. Tao
    • Organizer
      Bernoulli-IMS One World Symposium
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Sequential test for the criticality of branching processes2020

    • Author(s)
      K.Nagai, K. Hitomi, Y.Nishiyama and J. Tao
    • Organizer
      統計連合大会
    • Related Report
      2020 Research-status Report
  • [Presentation] The role of Bessel processes on the sequential test for a unit root in autoregressive process and criticality in branching process2020

    • Author(s)
      K.Nagai, Y.Nishiyama, K. Hitomi, and J. Tao
    • Organizer
      統計連合大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Statistical Sequential Analysis of Autoregressive Processes2019

    • Author(s)
      K.Nagai, Y.Nishiyama, K. Hitomi, and J. Tao.
    • Organizer
      Data Science Seminar, Shiga University
    • Related Report
      2019 Research-status Report
  • [Presentation] Monitoring Unit Root in Sequentially Observed Autoregressive Processes against Local-to-unity hypotheses2019

    • Author(s)
      K.Nagai, Y.Nishiyama, K. Hitomi, and J. Tao.
    • Organizer
      62nd ISI World Statistics Congress 2019 (ISI WSC 2019), Kuala Lumpur, Malaysia
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Joint Asymptotic Normality of Stopping Times and Sequential Estimators in Monitoring Autoregressive Processes2019

    • Author(s)
      K.Nagai, Y.Nishiyama, K. Hitomi, and J. Tao.
    • Organizer
      62nd ISI World Statistics Congress 2019 (ISI WSC 2019), Kuala Lumpur, Malaysia
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] The relationship between Dickey-Fuller test and Sequential unit root test for first-order autoregressive model2019

    • Author(s)
      K.Nagai, Y.Nishiyama, K. Hitomi, and J. Tao.
    • Organizer
      Japanese joint statistical meeting 2019, Shiga University
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Sequential Unit Root Test2019

    • Author(s)
      K.Nagai, Y.Nishiyama, K. Hitomi, and J. Tao.
    • Organizer
      Econometrics Symposium in honor of Peter M. Robinson
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-07-04   Modified: 2024-01-30  

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