Example: air traffic controller
Stata Journal Robust Standard Errors
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Fitting generalized estimating equation (GEE ... - Stata
www.stata.comŁ These methods not yet implemented in standard software (requires estimation of weights and more complicated variance formula) 3/16/2001 Nicholas Horton, BU SPH 16 Variance estimators Ł Empirical (aka sandwich or robust/semi-robust) consistent when the mean model is correctly specified (if no missing data)