Returns the variance-covariance matrix for a `Model` object. Specifically, this function will return the inverse GLS information matrix for the fixed effect parameters. Small sample corrections can be accessed directly from the Model using `Model$small_sample_correction()`. The varaince-covariance matrix including the random effects can be accessed using `Model$information_matrix(include.re = TRUE)`.
# S3 method for Model
vcov(object, ...)
A variance-covariance matrix.
A `Model` object.
Further arguments passed from other methods