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firstc
2012 Jul 20
0
Forced inclusion of varaibles in validate command as well as step
Dear prof. Harrell,
I'm not able to use the force option with fastbw, here an example of the error I've got (dataset stagec rpart package):
> fitstc <- cph(Surv(stagec$pgtime,stagec$pgstat) ~ age + eet + g2 + grade + gleason + ploidy, data=stagec)
> fbwstc <- fastbw(fitstc,rule="aic",type="individual")
> fbwstc
Deleted Chi-Sq d.f. P Residual d.f. P AIC
eet 0.19 1 0.6610 0.19 1 0.6610...