This is a problem in the lmtest package:
"lrtest.default" is exported as a function rather than declared as an
S3method in its NAMESPACE. I am CCing the maintainer.
For the meantime, you hav to import the default function explicitly, I
believe.
Best,
Uwe Ligges
On 10.01.2012 19:17, Stephanie M. Gogarten wrote:
In my own package, I want to use the default S3 method of the generic
function lrtest() from the lmtest package. Since I need only one
function from lmtest, I tried to use importFrom in my NAMESPACE:
importFrom(lmtest, lrtest)
However, this fails R CMD check in the examples:
Error in UseMethod("lrtest") :
no applicable method for 'lrtest' applied to an object of class
"c('glm', 'lm')"
Calls: assocTestRegression ... append -> RunRegression -> append ->
unlist -> lrtest
Relevant line of code in assocTestRegression is
tmp <- append(tmp, unlist(lrtest(mod, mod0))[c(8,10)])
where mod and mod0 are both results of the glm() function.
If I instead import the entire package in my NAMESPACE:
import(lmtest)
The example runs without error. Is there a way to import all methods for
an S3 generic function without importing the entire package?
thanks,
Stephanie Gogarten
sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] lmtest_0.9-28 zoo_1.7-4
loaded via a namespace (and not attached):
[1] grid_2.14.0 lattice_0.20-0 tools_2.14.0
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