On Wed, 21 Apr 2004, [iso-8859-1] Göran Broström wrote: > More seriously, the difference may well be of numerical character, > different convergence criteria, "unbalanced" data, etc. It is really > impossible to say without knowing what your data are (and without looking > into the code of coxph and cph).
The Cox partial loglikelihood is concave, so it really doesn't take much numerical care to get the right maximum (unlike some of the parameteric survival models) except on really ugly data sets. This one requires reading either the output or the documentation, rather than the code. Reading the documentation is especially important for the Design package -- the whole point of the package is to provide a different interface to regression modelling. -thomas ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html