lmerModLmerTest-class: Represent Linear Mixed-Effects Models
In runehaubo/lmerTestR: Tests in Linear Mixed Effects Models

The lmerModLmerTest class extends lmerMod (which extends merMod) from the lme4-package.

An object of class lmerModLmerTest with slots as in lmerMod objects (see merMod) and a few additional slots as described in the slots section.

vcov_varpar: a numeric matrix holding the asymptotic variance-covariance matrix of the variance parameters (including sigma).
Jac_list: a list of gradient matrices (Jacobians) for the gradient of the variance-covariance of beta with respect to the variance parameters, where beta are the mean-value parameters available in fixef(object).
vcov_beta: a numeric matrix holding the asymptotic variance-covariance matrix of the fixed-effect regression parameters (beta).
sigma: the residual standard deviation.