[R] Large number of covariates in survival regressions

From: Thomas Davidoff <davidoff_at_haas.berkeley.edu>
Date: Thu 23 Jun 2005 - 10:58:20 EST


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

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