Displaying 3 results from an estimated 3 matches for "mayoscore4".
2009 Jul 15
1
negative Somers D from Design package
...ing wrong or is there an interpretation that makes sense ?
This is with the mayo data so its reproducible but the result with my data is very similar.
Many thanks in advance
library(survivalROC)
library(Design)
library(survival)
data(mayo)
Sm <- Surv(mayo$time,mayo$censor)
fm <- cph( Sm ~ mayoscore4 ,mayo,x=T,y=T,surv=T )
validate(fm, B=150,dxy=T)
Iteration 1 ....
index.orig training test optimism index.corrected n
Dxy -0.566027923 -0.566665407 -0.566027923 -0.0006374833 -0.565390440 150
R2 0.325860603 0.327350885 0.325860603 0.0014902826 0.324370...
2010 Dec 05
1
HOW to use the survivalROC to get optimal cut-off values?
...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$AUC,3)),
ylab="TP",main="Mayoscore 4, Method = NNE \n Year = 1") abline(0,1)
L...
2010 Dec 05
1
HOW to use str() after the survivalROC (or another library in R) to get optimal cut-off values
...e time-dependent survivalROC package.according to
the,reference
material,it only gives a partial set of ordered cut-off values .eg.
--------------------------------------------------------------------------------
data(mayo)
str(mayo)
attach(mayo)
ROC.1=survivalROC(Stime=time,status=censor,marker=mayoscore4,predict.time=365,lambda=0.05)
str(ROC.1)
plot(ROC.1$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...