Generic function for extracting an estimator for the bread of
sandwiches.
Usage
bread(x, ...)
Value
A matrix containing an estimator for the expectation of the negative
derivative of the estimating functions, usually the Hessian.
Typically, this should be an \(k \times k\) matrix corresponding
to \(k\) parameters. The rows and columns should be named
as in coef or terms, respectively.
Zeileis A (2006).
“Object-Oriented Computation of Sandwich Estimators.”
Journal of Statistical Software, 16(9), 1--16.
tools:::Rd_expr_doi("10.18637/jss.v016.i09")
Zeileis A, Köll S, Graham N (2020).
“Various Versatile Variances: An Object-Oriented Implementation of Clustered Covariances in R.”
Journal of Statistical Software, 95(1), 1--36.
tools:::Rd_expr_doi("10.18637/jss.v095.i01")