[R] difference between 2 ecdfs

[Zaihra T]

   Please chk out the url below it might be of some help for plotting step
   function or  *look like*  of step function.

   On Thu, 27 Mar 2008 09:03:58 -0400 wrote:
   > Thanks to David and Zaihra for their help.
   >
   > Besides plotting the difference between 2 ecdfs, I also would like it to
   > *look like* a step function. Any suggestion?
   >
   > -----Original Message-----
   > From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
   > On Behalf Of David Winsemius
   > Sent: Friday, March 21, 2008 8:51 PM
   > To: r-help at stat.math.ethz.ch
   > Subject: Re: [R] difference between 2 ecdfs
   >
   > In article
   > <0FF736F1E306A446A88FD41FDDDC10AF1C77B0 at BWPW05.f2.enterprise>,
   > wrote:
   >
   > > hi,
   > >
   > > a) i have something like:
   >! ; >
   > > ecdfgrp1<-ecdf(subset(mydata,TMT_GRP==1)$Y);
   > >
   > > ecdfgrp2<-ecdf(subset(mydata,TMT_GRP==2)$Y);
   > >
   > > how can i plot the difference between these 2 step functions?
   > >
   > > i could begin with ecdfrefl<-function(x){ecdfgrp2(x)-ecdfgrp1(x);} ...
   > > what next?
   > >
   > #not tested ...mydata not provided
   >
   > ecrange<-range(mydata$Y)
   >
   > plot(ecdfrefl(seq(from=ecrange[1],to=ecrange[2],by=0.2))
   >
   >
   > > b) if i have a vector with repeated numeric values how can i get the
   > > subset without repeated values .e.g (0,4,0,2,2) ----> (0,4,2) ?
   > >
   >
   > ?unique
   >
   > > ttt<-c(1,3,5,5,5,7)
   > > unique(ttt)
   > [1] 1 3 5 7
   >
   > --
   > David Winsemius
   >
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   > PLEASE do read the posting guide
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   > and provide commented, minimal, self-contained, reproducible code.