R help - Sep 2005 - Problem with tick marks in lines.survfit (package survival)

I have attempted to follow posting guidelines but I have failed to find out 
what I am doing wrong here.
 I am trying to use lines.survfit to plot a second curve onto a survival 
curve produced by plot.survfit. In my case this is to be a progression free 
survival curve superimposed upon an overall survival curve, but I will 
illustrate my problem using the example given in the help for lines.survfit.
 I would like to have tick marks for censored data points on both curves, so 
I would like to do something like:
 > fit <- survfit(Surv(time, status) ~ sex,
pbc,subset=1:312)
> plot(fit[2], mark.time=TRUE, xscale=365.24,
+ xlab='Years', ylab='Survival')
> lines(fit[1], lwd=2, xscale=365.24, mark.time=TRUE)
 but when I do this, no tick marks appear on the second curve. Can anyone 
see what I am doing wrong here?
 Rachel

	[[alternative HTML version deleted]]

Sorry, my previous email seems to have come through in a rather odd
format. Also I forgot to add version and OS information, now included
below. My original query was:

I have attempted to follow posting guidelines but I have failed to
find out what I am doing wrong here.
 
I am trying to use lines.survfit to plot a second curve onto a
survival curve produced by plot.survfit. In my case this is to be a
progression free survival curve superimposed upon an overall survival
curve, but I will illustrate my problem using the example given in the
help for lines.survfit.
 
I would like to have tick marks for censored data points on both
curves, so I would like to do something like:
 
> fit <- survfit(Surv(time, status) ~ sex, pbc,subset=1:312)
> plot(fit[2], mark.time=TRUE, xscale=365.24,
+              xlab='Years',
ylab='Survival')
> lines(fit[1], lwd=2, xscale=365.24, mark.time=TRUE)
 
but when I do this, no tick marks appear on the second curve. Can
anyone see what I am doing wrong here?
 
Rachel

Here are the version data:

platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    2              
minor    1.1            
year     2005           
month    06             
day      20             
language R

How about:
plot(fit, mark.time=TRUE, xscale=365.24,xlab='Years',
ylab='Survival',lwd=c(2,1))

Rob
----- Original Message ----- 
From: "Rachel Pearce" <pearce.rachel at gmail.com>
To: <r-help at stat.math.ethz.ch>
Sent: Monday, September 19, 2005 4:59 AM
Subject: [R] Problem with tick marks in lines.survfit (package survival)

> I have attempted to follow posting guidelines but I have failed to find
out
> what I am doing wrong here.
>  I am trying to use lines.survfit to plot a second curve onto a survival
> curve produced by plot.survfit. In my case this is to be a progression
free
> survival curve superimposed upon an overall survival curve, but I will
> illustrate my problem using the example given in the help for
lines.survfit.
>  I would like to have tick marks for censored data points on both curves,
so
> I would like to do something like:
>  > fit <- survfit(Surv(time, status) ~ sex, pbc,subset=1:312)
> > plot(fit[2], mark.time=TRUE, xscale=365.24,
> + xlab='Years', ylab='Survival')
> > lines(fit[1], lwd=2, xscale=365.24, mark.time=TRUE)
>  but when I do this, no tick marks appear on the second curve. Can anyone
> see what I am doing wrong here?
>  Rachel
>
> [[alternative HTML version deleted]]
>
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