Generic function for extracting an estimator for the bread of sandwiches.

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`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.

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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