---------- Forwarded message ----------
From: Qian <qianguangy...@gmail.com>
Date: 2010/10/21
Subject: HOW to use the survivalROC to get optimal cut-off values?
Dear sir,
I am a student who want to use the time-dependent survivalROC
package.according to the,reference material,it only gives a set of ordered
cut-off values .eg.
-------------------------------------------------------------------------
data(mayo)
str(mayo)
attach(mayo)
ROC.1=survivalROC(Stime=time,status=censor,marker=mayoscore4,predict.time=365,lambda=0.05)
str(ROC.1)
plot(ROC.1$FP, ROC.1$TP, type="l", xlim=c(0,1), ylim=c(0,1),
xlab=paste( "FP", "\n", "AUC = ",round(ROC.1$AUC,3)),
ylab="TP",main="Mayoscore 4, Method = NNE \n Year = 1")
abline(0,1)
List of 6
$ cut.values : num [1:313] -Inf 4.58 4.9 4.93 4.93 ... *only 5
values
* $ TP : num [1:313] 1 0.999 0.999 0.999 0.998 ...
$ FP : num [1:313] 1 0.997 0.993 0.99 0.987 ...
$ predict.time: num 365
$ Survival : num 0.93
$ AUC : num 0.888
----------------------------------------------------------------------------------------
so i dont know
how to use the survivalROC to get optimal cut-off values?(only 5 values)
Thank you very much!
YOURS SINCERELY
GY QIAN
SHANGHAI,CHINA
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
