Displaying 2 results from an estimated 2 matches for "pgtime".
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2007 Feb 26
2
survival analysis using rpart
Hello,
I use rpart to predict survival time and have a problem in interpreting the
output of ?estimated rate?. Here is an example of what I do:
> stagec <-
> read.table("http://www.stanford.edu/class/stats202/DATA/stagec.data",
> col.names=c("pgtime", "pgstat", "age","eet", "g2", "grade", "gleason",
> "ploidy"))
> fit <- rpart(Surv(pgtime, pgstat) ~ age + eet + g2 + grade + gleason +
> ploidy, data=stagec)
Result:
1) root 146 195.411600 1.0000000
2)...
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 -1.81
age 0.74 1 0....