What is the proper method of exporting an S3 method from a package with a
NAMESPACE when the base method is from a package which does not have a
namespace?

EG,  The Design library defines 'contrast', 'contrast.ols', ..  and I've
written 'contrast.lm' which I want to include in a private package.   If I
put

        S3method(contrast, lm)

in the NAMESPACE file, R CMD check fails with

Error in .tryQuietly({ : Error in library(package, lib.loc = lib.loc,
character.only = TRUE, verbose = FALSE) : 
        package/namespace load failed
Execution halted

For the moment, I've simply put contrast.lm in the exports, but I would like
to know what the proper procedure is.

Gregory R. Warnes
Manager, Non-Clinical Statistics
Pfizer Global Research and Development



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