Lu, Jiang wrote:
Dear R helper,
I encountered a problem when I tried to plot the cumulative failure rate
(i.e. 1 - survival probability). I have used the following code to plot. The
scenario is that patients are randomized to different treatment arm (rev in
the code), the PCI revascularization was monitored over 5 years.
#R code
testfit <- survfit(Surv(pcifu,pci)~rev,data=subproc)
testfit$surv <- 1 - testfit$surv
testfail <- plot(testfit, mark.time=FALSE,col=1:2, main='Failure Rate')
#End of R code
I arbitarily replaced testfit$surv by computing 1 minus the original
survival rate. So far so good. However, when I plot the manipulated
"testfit", there is a vertical line plotted at x=0, y=0:1. I checked
testfit$time and testfit$surv, nothing weird there. I am very confused where
the vertical line at starting point of time 0 came from. How can I get rid
of it?
Would you pleae help me with this? Thanks a lot!
Jiang
Also see the survplot.* functions in the Design package and their fun
argument, e.g., fun=function(y)1-y
Frank
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Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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and provide commented, minimal, self-contained, reproducible code.
