On 2016-02-08 14:11, 于慧琳 wrote:
Hi guy,I have some problems when plotting survival curves for the
survfit object.My survfit model is as
follows:fit6<-survfit(Surv(Survival_time_year_,event)~Race_1_Desc,data=data6)Race_1_Desc
is a indicator variable which has 0 and 1 values.However, in my
dataset, all of the Race_1_Desc are of value 0, which means I have
only 1 group.When I plot my survival curve use the following
command,plot(fit6,col=c("blue","red"),xlab="Survival
Time",ylab="Survival Probability",main="Survival Plot for Leaf 6")
It is correct that I only has one curve for Race_1_Desc coded as 0,
which is the blue full line. But there are also two dashed line, one
is red and one is blue.I just want to know what are the two dashed
lines mean and why the show up in the plot.
Maybe they are confidence limits? Read the help page for plot.survfit,
especially 'conf.int'.
Göran
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