Re: [R] difference between 2 ecdfs

From: Zaihra T <zaihra_at_uwindsor.ca>
Date: Thu, 27 Mar 2008 09:10:16 -0400

   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@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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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu 27 Mar 2008 - 13:15:24 GMT

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