fev1                    FEV1 data from the Six Cities Study
print.vc_ci             Print method for confidence intervals
tidy.vc_ci              Tidy confidence intervals
vc_ci                   Confidence intervals for covariance parameters
vc_loglik               Log-likelihood as a function of the covariance
                        parameters
vc_model.lmerMod        Model for inference on covariance parameters
vc_test                 Score test for covariance parameters
