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10true
2007 Jan 25
0
cox.zph vs log-log survival plot
...ortionality with cox.zph with age continuous:
> cox.zph(coxph(Surv(TTP,CENSOTTP)~eta))
rho chisq p
eta -0.0154 0.0225 0.88
and categorical (eta<60):
> cox.zph(coxph(Surv(TTP,CENSOTTP)~eta<60))
rho chisq p
eta < 60TRUE 0.0168 0.0255 0.873
it seems ok but when I check graphical pattern of log-minus-log Kaplan Meier I see a convergent-divergent pattern, which seems violating proportionality:
> plot(survfit(Surv(TTP,CENSOTTP)~eta<60),fun="cloglog",xlab="log TTP",ylab="log(-log(S)...