[R-pkg-devel] Determine subset from glm object

[Charles Geyer]

I need to find out from an object returned by R function glm with argument
x = TRUE
what the subsetting was.  It appears that if gout is that object, then

as.integer(rownames(gout$x))

is a subset vector equivalent to the one actually used.

I do also have the call to glm (as a call object) so can determine the
actual subset argument, but this seems to be not so useful because I don't
know the length of the original variables before subsetting.

So now my questions.  Is this idea above (using rownames) OK even though I
cannot find where (if anywhere) it is documented?  Is there a better way?
One more guaranteed to be correct in the future?

-- 
Charles Geyer
Professor, School of Statistics
Resident Fellow, Minnesota Center for Philosophy of Science
University of Minnesota
charlie using stat.umn.edu

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