Description Usage Arguments Value References See Also Examples
Generic function for extracting an estimator for the bread of sandwiches.
1 |
x |
a fitted model object. |
... |
arguments passed to methods. |
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 x k matrix corresponding
to k parameters. The rows and columns should be named
as in coef
or terms
, respectively.
The default method tries to extract vcov
and nobs
and simply computes their product.
Zeileis A (2006), Object-Oriented Computation of Sandwich Estimators. Journal of Statistical Software, 16(9), 1–16. URL http://www.jstatsoft.org/v16/i09/.
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