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Co-sponsorship analysis of party politics in the 20th National Assembly of Republic of Korea

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  • Baek, Seung Ki
  • Kim, Jonghoon
  • Lee, Song Sub
  • Jo, Woo Seong
  • Kim, Beom Jun

Abstract

We investigate co-sponsorship among lawmakers by applying the principal-component analysis to the bills introduced in the 20th National Assembly of Korea. The most relevant factor for co-sponsorship is their party membership, and we clearly observe a signal of a third-party system in action. To identify other factors than the party influence, we analyze how lawmakers are clustered inside each party, and the result shows significant similarity between their committee membership and co-sponsorship in case of the ruling party. In addition, by monitoring each lawmaker’s similarity to the average behavior of his or her party, we have found that it begins to decrease approximately one month before the lawmaker actually changes the party membership.

Suggested Citation

  • Baek, Seung Ki & Kim, Jonghoon & Lee, Song Sub & Jo, Woo Seong & Kim, Beom Jun, 2020. "Co-sponsorship analysis of party politics in the 20th National Assembly of Republic of Korea," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 560(C).
    • Handle: RePEc:eee:phsmap:v:560:y:2020:i:c:s0378437120306154
    DOI: 10.1016/j.physa.2020.125178
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    References listed on IDEAS

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    1. Dong-Hee Kim & Hawoong Jeong, 2005. "Systematic analysis of group identification in stock markets," Papers physics/0503076, arXiv.org, revised Oct 2005.
    2. Eduardo Alemán & Ernesto Calvo, 2013. "Explaining Policy Ties in Presidential Congresses: A Network Analysis of Bill Initiation Data," Political Studies, Political Studies Association, vol. 61(2), pages 356-377, June.
    3. Porter, Mason A. & Mucha, Peter J. & Newman, M.E.J. & Friend, A.J., 2007. "Community structure in the United States House of Representatives," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 386(1), pages 414-438.
    4. Fowler, James H., 2006. "Connecting the Congress: A Study of Cosponsorship Networks," Political Analysis, Cambridge University Press, vol. 14(4), pages 456-487, October.
    5. Zhang, Yan & Friend, A.J. & Traud, Amanda L. & Porter, Mason A. & Fowler, James H. & Mucha, Peter J., 2008. "Community structure in Congressional cosponsorship networks," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 387(7), pages 1705-1712.
    6. Riker, William H., 1982. "The Two-party System and Duverger's Law: An Essay on the History of Political Science," American Political Science Review, Cambridge University Press, vol. 76(4), pages 753-766, December.
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    Cited by:

    1. Kim, Jonghoon & Jeong, Hyeong-Chai & Baek, Seung Ki, 2022. "Symmetric Nash equilibrium of political polarization in a two-party system," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 607(C).

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