Displaying 2 results from an estimated 2 matches for "sbrier".
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brier
2005 Jun 29
1
sbrier (Brier score) and coxph
Hello
I've decided to try and distill an earlier rather ill focused question to
try and elicit a response. Any help is greatly appreciated. Why does mod.cox
not work with sbrier whilst mod.km does? Can I make it work?
> data(DLBCL)
> DLBCL.surv<-Surv(DLBCL$time,DLBCL$cens)
>
> mod.km<-survfit(DLBCL.surv)
> mod.cox<-survfit(coxph(DLBCL.surv~IPI, data=DLBCL))
>
>
> sbrier(DLBCL.surv, mod.km)
integrated Brier score
0.207645...
2006 Oct 27
1
Censored Brier Score and Royston/Sauerbrei's D
...ns) as a
measure of discrimination and have constructed smoothed calibration
plots. I would like to include some measures of overall model
performance, such as the censored Brier score and Royston/Sauerbrei's D
statistic (Stat Med 2004). With this in mind, I have 3 questions:
1) Can the "sbrier" function of the "ipred" library be used to calculate
the censored Brier score for a specific time point given known
predictions for that timepoint?
library(ipred)
data <- read.csv(file='c:\\....
time <- data$time # The time in years from diagnosis of cancer to
de...