R help - Jun 2005 - Large number of covariates in survival regressions

I am trying to run a survival time regression (no time dependence so  
exponential distribution) with a fairly large but not huge number of  
right hand side variables (about 60).
r seems to not be able to estimate coefficients or standard errors  
for many of the covariates but can for some of the covariates, so I  
don't think this is a missing values problem.
Stata does not have the same problem (although it is slow).
Any thoughts?

Thomas Davidoff
Assistant Professor
Haas School of Business
UC Berkeley
Berkeley, CA 94720
phone:     (510) 643-1425
fax:        (510) 643-7357
davidoff@haas.berkeley.edu
http://faculty.haas.berkeley.edu/davidoff


	[[alternative HTML version deleted]]