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Changes in Version 0.9-18
o forgot to export print() method for "coeftest" objects
Changes in Version 0.9-17
o added NAMESPACE
o improved dependency declaration in DESCRIPTION
Changes in Version 0.9-16
o updated all .rda data sets to RDX2
o enhanced sanity checking in dwtest()
Changes in Version 0.9-15
o new generic with flexible default method for lrtest(),
implementing asymptotic likelihood ratio tests. This works
if a logLik() method is provided and suitable methods for
updating models and checking consistency.
o simplified print output in coeftest()
Changes in Version 0.9-14
o now a default method for waldtest() is provided (replacing the
lm method). It works for "lm", "glm" and "survreg" objects.
Furtheremore, it is object-oriented and generally works if the
following methods are available: terms(), formula(), coef() (which
needs to be named, matching the names in terms() and vcov()),
vcov() (which can alternatively be user-supplied), df.residual(),
residuals() and update() (unless only fitted objects are supplied).
o the default coeftest() was enhanced, works now out of the box for
"mle" objects, a "survreg" method is added (needed because coef()
and vcov() do not necessarily match for "survreg" objects).
o the vcov argument was changed (almost) everywhere to vcov. to
avoid name clashes with the vcov() function.
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