what is the name for the robust variance estimator what is the meaning of robust variance estimate? what is robust variance estimator for clustered data what is the name for a regression undertaken with robust variance estimator for clustered data? why use robust variance estimators for clusters which regression is performed with a robust variance estimator what is the name for a regression undertaken with robust variance estimators what is robust variance for clustered data? what is the name for a regression undertaken with robust variance estimator what is robust variance estimator what is robust variance estimators what is the name of a regression undertaken with robust variance estimators for clustered data? what is a robust variance estimator what is the name for a regression undertaken with robust variance estimators for clustered data? what is robust variance why does ollis use robust variance estimator what is a robust variance estimator for clustered data? what is robust variance estimator for clustered data what is the name for a regression undertaken with robust variance estimator for clustered data? what is the name of a regression undertaken with robust variance estimators for clustered data?