Hi Thomas Sorry to bug you again after 6 months! I just wondered if there is a simple way to find the N after dropping groups with invariant outcomes - I am reading coxph.object and the structure of the returned object, but nothing jumps out at me.
With best wishes, David Hugh-Jones On 9 July 2009 14:37, Thomas Lumley <tlum...@u.washington.edu> wrote: > On Wed, 8 Jul 2009, David Hugh-Jones wrote: > >> Hello all >> >> I'm moving back and forth between stata and R at the moment - of course, >> using R whenever possible :-) >> >> I'm running conditional logits on some panel data and I get slightly >> different results and different N in the two programs. > > That's probably because you are using method="approximate" in R. > >> >> I understand why Stata is dropping the groups with all outcomes the >> same... >> this is inevitable in a conditional logit, right? > > Yes. > >> Is R doing the same? > > Yes. > > -thomas > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
