Sorry, yes I think that would work, for the example I gave, but I am trying to superimpose a curve onto an existing plot. The option of using "plot" to draw both curves is not available, since the data are (or were) in two different columns. For that reason I was trying to use "lines" for the second curve.
I used the example given with the package so that I didn't have to publish my own data (which are not mine to publish, if you see what I mean). I have now given up and created a new data frame with OS and PFS stacked on top of each other, but this is a very time-consuming workaround. Do you (or anyone) know how to make "lines.survfit" draw tick marks? Rachel On 19/09/05, Robert Baer <[EMAIL PROTECTED]> wrote: > How about: > plot(fit, mark.time=TRUE, xscale=365.24,xlab='Years', > ylab='Survival',lwd=c(2,1)) > > Rob > ----- Original Message ----- > From: "Rachel Pearce" <[EMAIL PROTECTED]> > To: <r-help@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]] > > > > ______________________________________________ > > R-help@stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > > > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html