Research

[in English]

• 1. *2025. "Environmental Protection after Civil War: A Difference-in-Geographic-Discontinuity Approach," with Kyosuke Kikuta. Journal of Peace Research, 62(3): 738–752.(a)(e) [DOI] [Replication Materials]
     Previous ver.: IDE-JETRO Discussion Paper [Ver. of IDE-JETRO Discussion Paper].

  2. *2024. "A Unified Approach to Measuring Unequal Representation,"  with Junichiro Wada. Public Choice, 201: 287–308.(c) [DOI] [Replication Materials]

  3. *2021. "Malapportionment in Space and Time: Decompose It!" with Junichiro Wada and Yuko Kasuya. Electoral Studies, 71: 102301.★(b) (c)[DOI] [Replication Materials]
     Previous ver.: "The State of Malapportionment in the World," with Yuko Kasuya. Prepared for the Annual Meeting of the Australian Political Science Association, Sydney, September 30-October 1, 2014.(b) [SSRN]
     Extended ver. of "The State of Malapportionment in the World," with Junichiro Wada and Yuko Kasuya. Prepared for the Annual Meeting of the American Political Science Association, Philadelphia, September 1-4, 2016 & for the 2017 Asian Political Methodology Meeting, Sydney, January 9-11, 2017.★ [Web page] 

  4. *2018. "Studying Malapportionment Using α-Divergence," with Junichiro Wada. Mathematical Social Sciences, 93: 77–89.(b)(c)[DOI] [Replication Materials]

[in Japanese]

• 1. 2023. "Apportionment and the Population Figure: A Case Study on the 2016 Electoral Reform in Japan" [定数配分と基準人口―2016年「衆議院議員選挙区画定審議会設置法及び公職選挙法の一部を改正する法律」の成立までの過程を事例として―], with Junichiro Wada. Japanese Journal of Electoral Studies [選挙研究] 39(1):107–121.★(d)  [Article] [オンライン補遺・訂正事項・再現用ファイル] [Publisher]
     The Japanese Association of Electoral Studies Best Paper Award 2023 [Announcement]

  2. 2011/2012. "A 'Pragmatic Approach' in Selecting and Developing Measures of Democracy: Re-analyzing the Relationship between Democracy and Economic Growth" [民主主義指標と「プラグマティック・アプローチ」―経済成長の説明要因としての民主主義に関する計量分析―]. Public Choice Studies [公共選択の研究] (57):31–45.(c) [DOI]

[in English]

• 1. 2017. "Conceptual Vacuum in Measuring Democracy: The Political Process beyond Aggregation," based on Chapters 1, 3, and 4 of my PhD dissertation. Tokiwadai Journal of Human Sciences [常盤台人間文化論叢] 3: 23–45.(c)(d) [Article] [Online Appendix]

[in Japanese]

• 1. 2011. "Measuring Democracy for Empirical Studies: A Review" [民主主義指標の現状と課題 ]. Journal of Law and Political Studies [法学政治学論究] 90: 103–136.(c) [Article]

[in English]

• 1. 2019. "Changing Legislature, Changing Politics: Quotas, Electoral Systems, and Political Representation," with Yoshiaki Kobayashi. Gill Steel, Ed. Beyond the Gender Gap in Japan, pp. 247–264 (Ann Arbor, MI: University of Michigan Press).(b) [Publisher] 

  2. 2015. "Legislative Malapportionment in Asia," with Yuko Kasuya. Ronald U. Mendoza, Edsel L. Beja Jr., Julio C.Teehankee, Antonio G.M. La Viña, and Maria Fe Villamejor-Mendoza, Eds. Building Inclusive Democracies in ASEAN, pp. 257–281 (Philippines: Anvil Publishing).(b)(c) [Publisher]

  3. 2010. "General, Global, or Particular Effects? A Regional Comparison of the Impact of Democracy and Other Factors on Civil War." Yoshiaki Kobayashi and Tobin Im, Eds. Bureaucracy and Bureaucrats in Japanese and Korean Civil Society, pp. 151–178 (Tokyo: Bokutaku-sha).(a) [Publisher]

[in English]

• 1. 2023. "Public Health in the Aftermath of Civil War: A Spatial Time-Series Cross-Sectional Analysis." Public Choice Studies [公共選択] (79): 143–156.(a)(e) [DOI] [Web Appendix, Errata, and Replication Materials] [CORRECTION]

  2. 2023.  "The Malapportionment-Generating Process in Latin America: A Decomposition Analysis of Electoral Inequality in Argentina, Brazil, and Chile." Tokiwadai Journal of Human Sciences [常盤台人間文化論叢] 9: 53–73.(b)(c) [Article][Replication Materials]

  3. 2016. "The (In)Significant Role of the Legislature in the Budgetary Process." Japanese Political Science Review 3: 29–41. [Article](b)
     Previous ver.: Paper prepared for the 2012 Annual Meeting of the American Political Science Association, New Orleans, LA, August 30-September 2, 2012. [SSRN]

[in Japanese]

• 1. 2020. "A Proposal for Conceptualizing and Measuring Unequal Representation" [「代表の不平等」（Unequal Representation）に関する新たな概念と指標の可能性]. Journal of Law, Politics and Sociology [法学研究] 93(1): 419–444.(c) [Article][Online Appendix is available upon request]

  2. 2017. "Historical Transition of Malapportionment in Japan’s House of Representatives: What Does α-Divergence Tell Us?" [衆院選における一票の格差の変遷―αダイバージェンスを用いて―], with Junichiro Wada. Public Choice Studies [公共選択] (67): 104–121.(c) [DOI]

  3. 2013. "Democracy, Deliberation, and Public Choice" [民主主義・熟議・公共選択]. Public Choice Studies [公共選択] (59): 66–85.(d) [Publisher] [DOI]

[in Japanese]

1. 2025. Encyclopedia. 「民主主義指標」『比較政治学事典』丸善出版（180–181頁）.(c) [Publisher]

2. 2022. 日本政治学会文献委員会.「2021年学界展望」『年報政治学』（「国際政治・国際関係論」[225–228頁] 担当）.(a) [DOI]

3. 2022. Book Review. 坂井亮太著『民主主義を数理で擁護する』週刊読書人.(d) [Publisher]

4. 2021. Encyclopedia. 「2-1-10. 空間とデータ分析」『都市科学事典』春風社.(e) [Publisher]

5. 2021. Book Review. Hidekuni Washida. Distributive Politics in Malaysia: Maintaining Authoritarian Party Dominance. Public Choice Studies [公共選択](76): 128–131.(b) [Publisher]

6. 2019. Textbook. 「民主主義にはどのような制度があるのか？執政府-立法府関係と一票の格差」福井英次郎編『基礎ゼミ政治学』世界思想社.(b) [Publisher]

第4章で紹介される「コンドルセの陪審定理」の再現プログラムについてはこちら（当該章の筆者は私ではありません）。

7. 2012. Book Review. 大村華子著『日本のマクロ政体―現代日本における政治代表の動態分析』 Public Choice Studies [公共選択](58): 127–129.(b) [Publisher] [DOI]

[in English]

• • "Fair Election as Probatio Diabolica? A Bayesian-Like Geometric Interpretation of Digit-Based Election Forensics." Prepared for the 2017 Asian Political Methodology Meeting, Sydney, January 9-11, 2017. [Poster (Ver. Jan. 2017)] [Web page]; the 2017 American Political Science Association, San Francisco, August 31-September 3, 2017 [Poster (Ver. Aug. 2017)] (in progress).(c)

  • "Who Redistricts Determines How It Redistricts: Estimating the Causal Effect of Independent and Effective Delimitation Authority on Malapportionment." Prepared for the Annual Meeting of the Midwest Political Science Association, Chicago, IL, April 5-8, 2018.(b)

  • "Feudal Domains and Electoral Districts: A New Method of Quantifying the Path Dependence of Han" [旧藩の境界と選挙区―その経路依存性と変動に関する分析], with Yukihiro Nakajima, Tomoyuki Furutani, and Yuichiro Shimizu. Prepared for the 2018 Annual Meeting of the GIS Association of Japan, Tokyo Metropolitan University, October 19-21, 2018 [Conference Proceedings]; for the 6th Asian Political Methodology Meeting, Doshisha University, Kyoto, January 5-6, 2019 [Web page].(e)

  • "Who Is Counted? The (In)Different Selection of Population Figures for Measuring Malapportionment," with Yukihiro Nakajima and Junichiro Wada (under review).★(b)(c)
    Previous versions:
    "Who Is Counted? The Debate on the (In)Different Selection of the Population Figure in Measuring Malapportionment," with Junichiro Wada. Prepared for the 2022 Annual Meeting of the Japanese Association of Electoral Studies, Ishikawa, May 7-8, 2022.
    "Who Is Counted? Examining the Measurement of Malapportionment via Population, Registered Voters, and Cast Votes." (as an independent study) 

• • "The Desired Political Entropy as a Measure of Disproportionality," with Jaehyun Song [associated R package] (under development/ analysis).★(c)

  • "Appointed Seats and Reserved Seats in Selectorate Theory: Introducing a Dataset for Latin American Countries," with Makoto Imai. Prepared for the 2024 Annual Meeting of the Japanese Association of Electoral Studies, Kochi, May 18-19, 2024.
    The Japanese Association of Electoral Studies Best Poster Award 2024 [Announcement]

  • "'Equal' Participation Always Equalizes Us? The Lijphart Hypothesis Retested." Prepared for the Annual Meeting of the Japanese Political Science Association, Osaka, October 1-2, 2016.(b)

  • "Deforestation in the Aftermath of Warfare: A Spatial Time-Series--Cross-Sectional Analysis" (in progress).
    Drastically extending "A Spatial Analysis of the Environmental Effect of Warfare."  Prepared for the 2018 Annual Meeting of the American Political Science Association, Boston, MA, August 30-September 2, 2018 [Poster] (Ver. Aug. 2018).(a)(e)

[in Japanese]

• "Fractionalization, Polarization, and Civil War" [民族構成と内戦―「分裂化／分極化」と「発生／規模」の観点から―].(a) [Abstract and results in English] [Replication materials]