Wild Bootstrap Inference for Wildly Different Cluster Sizes
The cluster robust variance estimator (CRVE) relies on the number of clusters being sufficiently large. Monte Carlo evidence suggests that the "rule of 42" is not true for unbalanced clusters. Rejection frequencies are higher for datasets with 50 clusters proportional to U.S. state populations than with 50 balanced clusters. Using critical values based on the wild cluster bootstrap performs much better. However, this procedure fails when a small number of clusters is treated. We explain why CRVE t statistics and the wild bootstrap fail in this case, study the "effective number" of clusters, and simulate placebo laws with dummy variable regressors.
|Date of creation:||Dec 2015|
|Publication status:||Forthcoming in Journal of Applied Econometrics|
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