[R] Cox PH Warning Message
mayeul.kauffmann at tiscali.fr
Sat Oct 16 12:32:40 CEST 2004
Can anybody tell me what the message below means and how to overcome it.
X matrix deemed to be singular; variable 2 in: coxph(Surv(age_at_death,
death) ~ project$pluralgp + project$yrborn + ........."
Your 2nd covariate (yrborn) is colinear to the other covariates (or nearly
colinear). R drops it, but warns you. The results are OK.
UniversitÃ© Pierre MendÃ¨s France
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