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coef16
2011 Feb 19
0
contrasting Somer's D from Design package
...385821e-05
2.733949e-05 10
Q 5.319893e-02 5.350735e-02 5.292713e-02 5.802143e-04
5.261872e-02 10
But if I fit a stratified cox model to the same data, the result becomes:
> cox1b<-cph(surv.obj~factor(ecog)+factor(grade)+factor(tumor)+factor(extra)+strat(ft),x=T,y=T,surv=T)
> coef1b<-coef(cox1b)
> coef1b
ecog=1 ecog=2 grade=2 grade=3 tumor=2 tumor=3
extra=1
0.1058620 0.5074692 0.3190904 0.4728515 0.5631035 1.2190005
0.3500670
> validate(cox1a,dxy=T,method="b",B=10,u=12) #for whatever u values I try,
> si...