when lmer is used what do i need to estimate the robustness of the standard error when do you need robust standard errors in r what is lmer when using hellman procedure is standard error consistent what is a standard error when using heckman's lmer? which of the following describes the standard error in the lmer procedure? when using heckman procedure do i need robust standards errors in r which standard error is used when using heckman's procedure when doing the two stage procedure does lmer require a robust standard error what is lmer standard error? which of the following is a standard error for heteroscedastic consistency does lmer need heteroscedasticity is lmer heteroscedastic does lmer include bootstrapping what does lmer stand for in r does heckman's two stage procedure have standard error lmer lmer lmer which of the following describes heteroscedasticity consistent standard errors? does hellman's two stage procedure require robustness is lmer robust