[R] 2 KM curves on the same plot

array chip @rr@ypro|||e @end|ng |rom y@hoo@com
Wed Sep 30 04:26:46 CEST 2020

Hi Jim,

I tried the clip() function below, surprisingly it did not work! I read the R help file and feel your script should work. To have a workable example, I used the ovarian dataset in the survival package as an example:



fit1 <- survfit(Surv(futime, fustat) ~ rx, data = ovarian1)
fit2 <- survfit(Surv(futime, fustat) ~ rx, data = ovarian2)

plot(fit1, xlim=c(0,1200), col = 1:2)
lines(fit2, col = 3:4,lty=2)

I can still see that the extra horizontal line on the top. 

Can you or anyone have any suggestion what went wrong?



On Tuesday, September 29, 2020, 01:35:48 AM PDT, Jim Lemon <drjimlemon using gmail.com> wrote: 

Hi John,
Perhaps the most direct way would be:

plot(fit1, col=1:2)

Remember that the new clipping rectangle will persist until you or
something else resets it.


On Tue, Sep 29, 2020 at 10:34 AM array chip via R-help
<r-help using r-project.org> wrote:
> Hello,
> Can anyone suggest a simple way to generate a Kaplan-Meier plot with 2 survfit objects, just like this one:
> https://drive.google.com/file/d/1fEcpdIdE2xYtA6LBQN9ck3JkL6-goabX/view?usp=sharing
> Suppose I have 2 survfit objects: fit1 is for the curve on the left (survtime has been truncated to the cutoff line: year 5), fit2 is for the curve on the right (minimum survival time is at the cutoff line: year 5), but if I do the following:
> plot(fit1, col=1:2)
> lines(fit2,col=1:2)
> Then I will have an horizontal line on the top that connect from 0 to 4 years, which I do not want that to be drawn (see blue arrow below):
> https://drive.google.com/file/d/178mQGlhnaOg9PA-oE-W_W5CtrGD03ljH/view?usp=sharing
> Can anyone have a strategy to make this kind of plot happen?
> Thanks,
> John

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