vcov.bellreg {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 class 'bellreg'
vcov(object, ...)

Arguments

object

an object of the class bellreg.

...

further arguments passed to or from other methods.

Value

the variance-covariance matrix associated with the regression coefficients.

Examples

data(faults)
fit <- bellreg(nf ~ lroll, data = faults)
vcov(fit)