vcov.nonprobsvy {nonprobsvy}

Obtain Covariance Matrix estimation.

Description

A vcov method for nonprobsvy class.

Usage

## S3 method for class 'nonprobsvy'
vcov(object, ...)

Arguments

object

object of nonprobsvy class.

...

additional arguments for method functions

Details

Returns a estimated covariance matrix for model coefficients calculated from analytic hessian or Fisher information matrix usually utilising asymptotic effectiveness of maximum likelihood estimates.

Value

A covariance matrix for fitted coefficients