Kjetil Brinchmann Halvorsen wrote:
I just discovered that when the VGAM package (not on CRAN) is loaded,
glm() doesn't work. This is because VGAM defines a family function()
which gets found
by glm() in place of the family function from stats.
Then VGAM:::family returns an object which doesn't have a $family
component, (it has a component
$vfamily).
I thought namespaces should protect us from this happening?
Yes and no:
Yes: The namespace would protect you if glm would call internally the
family function such as poisson().
No: Probably you have asked something like glm(....., family=poisson()).
Now the first instance of poisson() in the search path is used. You are
passing a call to poisson(), and this is not bound to any namespace. Of
course you can specify tha namespace such as
glm(....., family=stats::poisson()).
Uwe Ligges
Kjetil
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