Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/188918
Authors: 
Roodman, David Malin
MacKinnon, James G.
Nielsen, Morten Ørregaard
Webb, Matthew
Year of Publication: 
2018
Series/Report no.: 
Queen's Economics Department Working Paper 1406
Abstract: 
The wild bootstrap was originally developed for regression models with heteroskedasticity of unknown form. Over the past thirty years, it has been extended to models estimated by instrumental variables and maximum likelihood, and to ones where the error terms are (perhaps multi-way) clustered. Like bootstrap methods in general, the wild bootstrap is especially useful when conventional inference methods are unreliable because large-sample assumptions do not hold. For example, there may be few clusters, few treated clusters, or weak instruments. The Stata package boottest can perform a wide variety of wild bootstrap tests, often at remarkable speed. It can also invert these tests to construct confidence sets. As a postestimation command, boottest works after linear estimation commands including regress, cnsreg, ivregress, ivreg2, areg, and reghdfe, as well as many estimation commands based on maximum likelihood. Although it is designed to perform the wild cluster bootstrap, boottest can also perform the ordinary (non-clustered) version. Wrappers offer classical Wald, score/LM, and Anderson-Rubin tests, optionally with (multi-way) clustering. We review the main ideas of the wild cluster bootstrap, offer tips for use, explain why it is particularly amenable to computational optimization, state the syntax of boottest, artest, scoretest, and waldtest, and present several empirical examples for illustration.
Subjects: 
boottest
artest
waldtest
scoretest
Anderson-Rubin test
Wald test
wild bootstrap
wild cluster bootstrap
score bootstrap
multi-way clustering
few treated clusters
JEL: 
C15
C21
C23
C25
C36
Document Type: 
Working Paper
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