On Sep 22, 2010, at 1:39 PM, threshold wrote:
Hi,
there is a function to plot survival curves:
library(survival)
plot.KM <- function(survival, x, x_cut.off, main='', label='')
{
plot(survfit(survival ~ I(x >= x_cut.off)), main=main)
legend('bottomleft', c(expression(label >=
x_cut.off),expression(label <
x_cut.off)))
}
This is untested because "survival" is not an object for the rest of
us to survfit:
plot.KM <- function(survival, x, x_cut.off, main='', label='')
{
#really kind of worried about whether this part will work, but perhaps
you already have this running?
plot(survfit(survival ~ I(x >= x_cut.off)), main=main)
#####
## perhaps something like this ... untested d/t no data example
legend('bottomleft',
labels= bquote( .(label)>=.(x_cut.off),
.(label)<.(x_cut.off) ) )
}
(And if you have made such a Surv object, perhaps naming it something
other than the package name would be less confusing to us ordinary
mortals.)
-- David.
Now, I need to determine as the argument what appears in the legend.
I want
plot.KM(survival, x, x_cut.off=0.5, main='', label='ABC')
but what I get is ('label < x_cut.off') in legend instead of
'ABC<0.5'.
Symbol '>=' should be in mathematical form. will appreciate any help.
robert
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