[R] Plotting two ecdf curves on same axes
Frank E Harrell Jr
fharrell at virginia.edu
Tue Oct 15 21:21:43 CEST 2002
On Tue, 15 Oct 2002 17:30:17 +0200 (MEST)
Jane McFerren <jane.mcferren at lycos.co.uk> wrote:
> Dear R listers
>
> Could somebody please advise me how to draw two empirical cumulative distribution
> functions on the same set of axes?
>
> I know I should be using the ecdf command but I'm not sure what to add to it to force it
> to plot twice on the axes
>
> Thanks
> Jane
> ______________________________________________________
One way is
library(Hmisc)
ecdf(~ y, groups=grouping.variable)
You can also produce multiple panels:
ecdf(~ y | state, groups=urban.vs.rural)
--
Frank E Harrell Jr Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine http://hesweb1.med.virginia.edu/biostat
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