On Sun, 14 Dec 2008, John Fox wrote:
Dear Stas and David,
A couple of people have mentioned linear.hypothesis() in the car package,
which has methods for several kinds of models and a default method that will
work for any model that responds to coef() and vcov(). The delta.method()
function in the alr3 package is similarly general.
Despite its name, svycontrast() in the survey package also works for anything
with coef() and vcov() methods, for both linear and nonlinear combinations.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
tlum...@u.washington.edu University of Washington, Seattle
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