vcov.etregrob {ssmrob}

Extract Asymptotic Variance Covariance Matrix

Description

Extracts the variance covariance matrix of the robust endogenous treatment model fit

Usage

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

Arguments

object

object of class "etregrob"

...

currently not used

Value

Variance covariance matrix of the second stage. Variance covariance matrix of the selection stage can be extracted using the vcov function for the probit estimator, e.g. vcov(etregrob.object$stage1).

Author(s)

Mikhail Zhelonkin

See Also

etreg2steprobVcov