A generic method for obtaining standard and robust variance covariance matrix
# S3 method for cmdlr
vcov(object, robust = FALSE, ...)A model object of class 'cmdlr'
A boolean equal to TRUE if you want to return a robust variance covariance matrix based on a simple sandwich estimator. The default value is FALSE
Other arguments passed to the function
A matrix with row and column names equal to the parameters of the fitted model