bread.lmerMod           Extract Bread Component for Huber-White
                        Sandwich Estimator of Linear Mixed Effects
                        Models
estfun.lmerMod          Extract Case-wise and Cluster-wise Derivatives
                        for Linear Mixed Effects Models
llcont.lmerMod          Extract Case-wise Log Likelihoods for Linear
                        Mixed Effects Models
vcov.glmerMod           Extract Variance-Covariance Matrix of all
                        Parameters for Generalized Linear Mixed Effects
                        Models
vcov.lmerMod            Extract Variance-Covariance Matrix of all
                        Parameters for Linear Mixed Effects Models
