"Hi, Can anybody tell me what the message below means and how to overcome it. Thanks, Neil Warning message: 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. Mayeul KAUFFMANN Université Pierre Mendès France Grenoble France ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
