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A simple approach to dealing with partial contestation

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  • Ali Kagalwala
  • Thiago M. Q. Moreira
  • Guy D. Whitten

Abstract

Objective We propose a simple approach to dealing with partial contestation in models of multiparty elections. Methods Our proposed approach is to add a tiny value to the vote share of parties that do not contest a district and then to include dummy variables identifying those districts in which parties do not compete. We can then estimate a single system of equations using a seemingly unrelated regression (SUR) approach and Aitchison's log‐ratio transformation. In our SUR system, we interact the dummy variable for a party that partially contested districts with other predictors in the equation that uses the share of votes of the same party in the log‐ratio outcome. Finally, we estimate robust standard errors for predictors in this equation to address heteroscedasticity. Results We demonstrate the utility of our approach using simulated data and election results from the English parliamentary elections in 2017. Conclusion From our simulations, we find that our recommended approach performs as well as that proposed by Tom, Tucker, and Wittenberg. Our strategy is advantageous in that it is easy to estimate, uses information from all districts, and addresses partial contestation in real‐world elections with a single system of seemingly unrelated regressions.

Suggested Citation

  • Ali Kagalwala & Thiago M. Q. Moreira & Guy D. Whitten, 2024. "A simple approach to dealing with partial contestation," Social Science Quarterly, Southwestern Social Science Association, vol. 105(4), pages 948-964, July.
    • Handle: RePEc:bla:socsci:v:105:y:2024:i:4:p:948-964
    DOI: 10.1111/ssqu.13408
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    References listed on IDEAS

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    4. Jon C. Rogowski, 2014. "Electoral Choice, Ideological Conflict, and Political Participation," American Journal of Political Science, John Wiley & Sons, vol. 58(2), pages 479-494, April.
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    6. Duch, Raymond M. & Stevenson, Randy, 2005. "Context and the Economic Vote: A Multilevel Analysis," Political Analysis, Cambridge University Press, vol. 13(4), pages 387-409.
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