On Thu, May 13, 2004 at 02:10:35AM -0500, Paul Johnson wrote: > Dear Goran (and others) > > I did not know about the "eha" package, but reading the docs, I see many > things I've been looking for, including the parametric hazard model with > Weibull baseline. Thanks for the tip, and the package.
You can find that in 'survival' too. See ?survreg. Watch up for non-standard parametrization, though. > I still don't quite understand your point about the reason that coxph > crashes. Why does the difference of scale between the variables cause > trouble? I understand that a redundant set of variables would cause > singularity, but do not see why differing scales for variables would > cause that. Does the explanation lie in the optimization algorithm > itself? I'll read the eha package coxreg source code. I bet that will > show me what's going on in your fix, anyway. Nothing special is going on there. I use only standard linpack routines (found in R) for solving linear equations, and matrix inversion at the end. I think 'coxph' has its own optimizing routines. Peter D. explained why scaling can be a problem. Göran [...] -- Göran Broström tel: +46 90 786 5223 Department of Statistics fax: +46 90 786 6614 Umeå University http://www.stat.umu.se/egna/gb/ SE-90187 Umeå, Sweden e-mail: [EMAIL PROTECTED] ______________________________________________ [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