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.
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