bellreg (version 0.0.2.1)

vcov.bellreg: Variance-covariance matrix for a bellreg model

Description

This function extracts and returns the variance-covariance matrix associated with the regression coefficients when the maximum likelihood estimation approach is used in the model fitting.

Usage

# S3 method for bellreg
vcov(object, ...)

Value

the variance-covariance matrix associated with the regression coefficients.

Arguments

object

an object of the class bellreg.

...

further arguments passed to or from other methods.

Examples

# \donttest{
data(faults)
fit <- bellreg(nf ~ lroll, data = faults)
vcov(fit)
# }