Extract bread matrix from a teeMod model fit

An S3method for sandwich::bread that extracts the bread of the direct adjustment model sandwich covariance matrix.

Usage

# S3 method for class 'teeMod'
bread(x, ...)

Arguments

x

a fitted teeMod model

...

arguments passed to methods

Value

A \(2\times 2\) matrix corresponding to an intercept and the treatment variable in the direct adjustment model

Details

This function is a thin wrapper around .get_tilde_a22_inverse().