The Wild Bootstrap for Few (Treated) Clusters

James MacKinnon and Matthew Webb

No 274690, Queen's Economics Department Working Papers from Queen's University - Department of Economics

Abstract: Inference based on cluster-robust standard errors in linear regression models, using either the Student’s t distribution or the wild cluster bootstrap, is known to fail when the number of treated clusters is very small. We propose a family of new procedures called the subcluster wild bootstrap, which includes the ordinary wild bootstrap as a limiting case. In the case of pure treatment models, where all observations within clusters are either treated or not, the latter procedure can work remarkably well. The key requirement is that all cluster sizes, regardless of treatment, should be similar. Unfortunately, the analogue of this requirement is not likely to hold for difference-in-differences regressions. Our theoretical results are supported by extensive simulations and an empirical example.

Keywords: Financial Economics; Research Methods/Statistical Methods (search for similar items in EconPapers)
Pages: 41
Date: 2017-11
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Related works:
Journal Article: The wild bootstrap for few (treated) clusters (2018)
Working Paper: The Wild Bootstrap For Few (treated) Clusters (2017)
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Persistent link: https://EconPapers.repec.org/RePEc:ags:quedwp:274690

DOI: 10.22004/ag.econ.274690

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