Variance Covariance Computation for GLMM

Computes robust variance-covariance matrix for generalized linear mixed models fitted with glmer from the lme4 package. It allows specification of clustering and supports different types of variance estimations.

Arguments

obj

A glmerMod object representing the fitted model.

cluster

Optional; a vector indicating the cluster structure within the data. If NULL, attempts to retrieve cluster information from attributes of the model object.

type

Character string specifying the type of variance-covariance matrix to compute. Supported types include "classic", with potential for further types depending on method implementation.

Value

Returns a diagonal matrix with the computed variances for each fixed effect in the model.