Some heteroskedasticity-consistent covariance matrix estimators with improved finite sample properties
具有改进有限样本性质的若干异方差稳健协方差估计量
We examine several modified versions of the heteroskedasticity-consistent covariance matrix estimator of Hinkley (1977) and White (1980). On the basis of sampling experiments which compare the performance of quasi t statistics, we find that one estimator, based on the jackknife, performs better in small samples than the rest. We also examine finite-sample properties using modified critical values based on Edgeworth approximations, as proposed by Rothenberg (1988). In…