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Ideal Point Estimation for Various Political Actors and Multidirectional Analyses of the Role of Ideology in Contemporary Japan

Research Project

Project/Area Number 18K12708
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 06010:Politics-related
Research InstitutionGakushuin University

Principal Investigator

Miwa Hirofumi  学習院大学, 法学部, 教授 (20780258)

Project Period (FY) 2018-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsイデオロギー / 理想点推定 / 新聞 / 裁判官 / 最高裁判所 / 政治コミュニケーション / 司法政治 / 司法の独立性 / 計量テキスト分析 / 民主主義の後退 / 信念体系 / 言論人 / 憲法改正 / 論壇誌 / トピックモデル / テキストスケーリング / 項目反応理論モデル
Outline of Final Research Achievements

The primary purpose of this project was to measure the ideological positions (ideal points) of newspapers and judges in Japan, aiming to extend the scope of spatial theory, which helps us explore the role of ideology in contemporary Japan. For newspapers, I collected all editorials published by ten national and regional newspapers over one year and estimated their ideal points using quantitative text analysis methods. For judges, I compiled a dataset of non-unanimous Supreme Court decisions from 1948 to 2023 and estimated the ideal points of 189 Supreme Court justices based on their judgment behavior. The results support previous studies that claim Japan’s court leans conservatively as a consequence of the Liberal Democratic Party's long-term rule.

Academic Significance and Societal Importance of the Research Achievements

政治的アクターがイデオロギー的に近接した選択肢を好むと仮定する空間理論は,現代政治学において様々な政治現象の説明や予測に欠かせない。空間理論を適用するためには,政治的アクターのイデオロギー位置(理想点)の情報が必要であるが,日本では定量的なデータが十分でない。本研究課題では,従来の研究では理想点が定量化されていなかった新聞と裁判官について,独自に収集・構築したデータに基づいて理想点を推定した。新聞のデータは著作権の範囲内で他の研究者に公開しており,裁判官のデータも論文発表後に公開予定である。

Report

(7 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (19 results)

All 2024 2023 2022 2021 2020 2019 2018

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Open Access: 2 results,  Peer Reviewed: 2 results) Presentation (12 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] 2021年総選挙における有権者の政策選好および争点の重要度と投票2023

    • Author(s)
      三輪洋文
    • Journal Title

      選挙研究

      Volume: 38(2) Pages: 48-62

    • Related Report
      2022 Research-status Report
    • Open Access
  • [Journal Article] イデオロギーをどう測定するか2023

    • Author(s)
      三輪洋文
    • Journal Title

      三色旗

      Volume: 847 Pages: 3-10

    • Related Report
      2022 Research-status Report
  • [Journal Article] 現代政治におけるイデオロギーの役割2022

    • Author(s)
      三輪洋文
    • Journal Title

      法律時報

      Volume: 94(8) Pages: 18-23

    • Related Report
      2022 Research-status Report
  • [Journal Article] Detecting Voter Understanding of Ideological Labels Using a Conjoint Experiment2021

    • Author(s)
      Hirofumi Miwa, Reiko Arami, and Masaki Taniguchi
    • Journal Title

      Political Behavior

      Volume: - Issue: 2 Pages: 635-657

    • DOI

      10.1007/s11109-021-09719-5

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] イデオロギーに着目した日本の青年の政治的成熟度の検討2021

    • Author(s)
      三輪洋文・谷口将紀
    • Journal Title

      公共選択

      Volume: 75 Pages: 81-101

    • Related Report
      2020 Research-status Report
  • [Journal Article] Estimating Ideal Points of Newspapers from Editorial Texts2020

    • Author(s)
      Kaneko Tomoki, Asano Taka-aki, and Miwa Hirofumi
    • Journal Title

      International Journal of Press/Politics

      Volume: - Issue: 3 Pages: 719-742

    • DOI

      10.1177/1940161220935058

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] 戦後日本人の憲法意識――世論調査集積法による分析2020

    • Author(s)
      三輪洋文・境家史郎
    • Journal Title

      年報政治学

      Volume: 71(1)

    • NAID

      130008053198

    • Related Report
      2019 Research-status Report
  • [Presentation] Origins of “What-Goes-with-What” in a Country with Low Partisan and Ideological Loyalties.2024

    • Author(s)
      三輪洋文
    • Organizer
      日本選挙学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Democratic Backsliding Under Weak Polarization: Evidence from a Survey Experiment2023

    • Author(s)
      小椋郁馬・三輪洋文・粕谷祐子
    • Organizer
      日本政治学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Democratic Backsliding Under Weak Polarization: Evidence from a Survey Experiment2023

    • Author(s)
      Ikuma Ogura and Hirofumi Miwa
    • Organizer
      Midwest Political Science Association
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 2021年総選挙における有権者の政策選好と投票2022

    • Author(s)
      三輪洋文
    • Organizer
      日本選挙学会
    • Related Report
      2022 Research-status Report
  • [Presentation] Extracting Ideological Dimensions from Legislative Speeches in the Japanese Diet2021

    • Author(s)
      金子智樹・淺野良成・三輪洋文
    • Organizer
      日本選挙学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Why Voters Prefer Politicians with Particular Personal Attributes: The Role of Voter Demand for Populists2021

    • Author(s)
      三輪洋文
    • Organizer
      日本政治学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Who Shares Ideological Belief Systems with Political Elites? A Mixture Model-Based Approach2020

    • Author(s)
      三輪洋文
    • Organizer
      東大社研政治学オンラインワークショップ
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Ideal Point Estimation of Political Pundits Using Opinion Magazine-Authorship Data2020

    • Author(s)
      三輪洋文・大森翔子
    • Organizer
      計量・数理政治研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] 雑誌記事索引を用いたイデオロギー位置の推定とその政治コミュニケーション研究への応用2019

    • Author(s)
      大森翔子・三輪洋文
    • Organizer
      戦前戦後・比較政治史研究/現代政治過程研究フォーラム
    • Related Report
      2018 Research-status Report
  • [Presentation] 日本の最高裁裁判官のイデオロギー位置の推定2019

    • Author(s)
      三輪洋文
    • Organizer
      日本選挙学会
    • Related Report
      2018 Research-status Report
  • [Presentation] 動的線形モデルによる憲法意識の変遷の分析2019

    • Author(s)
      三輪洋文
    • Organizer
      日本政治学会
    • Related Report
      2018 Research-status Report
  • [Presentation] テキスト分析による新聞のイデオロギー位置の推定2018

    • Author(s)
      金子智樹・三輪洋文
    • Organizer
      日本政治学会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2025-01-30  

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