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Practical and Effective Approaches to Dealing With Clustered Data

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  • Esarey, Justin
  • Menger, Andrew

Abstract

Cluster-robust standard errors (as implemented by the eponymous cluster option in Stata) can produce misleading inferences when the number of clusters G is small, even if the model is consistent and there are many observations in each cluster. Nevertheless, political scientists commonly employ this method in data sets with few clusters. The contributions of this paper are: (a) developing new and easy-to-use Stata and R packages that implement alternative uncertainty measures robust to small G, and (b) explaining and providing evidence for the advantages of these alternatives, especially cluster-adjusted t-statistics based on Ibragimov and Müller. To illustrate these advantages, we reanalyze recent work where results are based on cluster-robust standard errors.

Suggested Citation

  • Esarey, Justin & Menger, Andrew, 2019. "Practical and Effective Approaches to Dealing With Clustered Data," Political Science Research and Methods, Cambridge University Press, vol. 7(3), pages 541-559, July.
    • Handle: RePEc:cup:pscirm:v:7:y:2019:i:03:p:541-559_00
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