I'm using 4.5r1 for the PC.
I have made some K-M event curves using stepfun as follows:
>plot(stepfun(ttf6m.st$time[arm.st==1],1 - tf6m.st$surv[arm.st==1]),
+ type='l',xlab='',ylab='',ylim=c(0,.20),bty='l',xaxs='i',yaxs='i')
>points(stepfun(ttf6m.st$time[arm.st==2],1 - ttf6m.st$surv[arm.st==2]),
+ type='l',lty=8)
And this looks just fine.
However, when I try to darken the dashed line, using lwd=10 or selecting
the line from the graph and changing it's weight using the dialog box, I
get a line that is darker but has filled in diamonds on it in many (but
not all) of the places where the function steps up.
I get the same problem making regular K-M curves, but the diamonds are
usually less frequent.
What is going on here? How can I get dark dashed lines?
Thanks for the help.
______________
Jim Box
DCRI Statistics
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