therneau at mayo.edu
Thu Mar 31 16:06:04 CEST 2011
A user sent me a query on survreg, which when boiled down is a request
to drop unused levels when setting up the X matrix.
I don't have a strong opinion one way or the other, but am loath to
make the change: I expect that code somewhere will break, perhaps a lot,
when the length of the coefficients changes.
On the other hand, at some point this change was made to lm(). Does
the R core have an opinion on which is better, or a pointer to
discussion that underlied the change to lm()? It could be enough to
push me over the edge. It would affect survreg, coxph, survfit,
survdiff, coxme, ...
More information about the R-devel