I'm a french medicine student and i work on oncology. I work about treatment oh breast cancer. I have 3 sub group of patient. I made some kaplan meyer survival curve, and i made a cox model.
On the survival curve, on the last observations there is a crossmatch of the different survival curve at 150 month . I study the validity of my model by study of residual by study the proportional risk. So i used Coxzph formula, but the global test is p< 0.05, so my model is not a proportional risk. Do you know how i can cut the cox model analysis before the 150 month, wich are the time where the curves are crossing? Thank you for your Help Dr Billemont ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
