Computes the "bread" (unscaled hessian) for the sandwich estimator of the
variance-covariance matrix for objects of class 'drc'.
Usage
# S3 method for class 'drc'
bread(x, ...)
Arguments
- x
object of class drc.
- ...
additional arguments. At the moment none are supported.
Value
The unscaled hessian matrix.
Details
The details are provided by Zeileis (2006).
References
Zeileis, A. (2006) Object-oriented Computation of Sandwich Estimators,
J. Statist. Software, 16, Issue 9.
