Re: [R] difference between 2 ecdfs

From: David Winsemius <dwinsemius_at_comcast.net>
Date: Fri, 21 Mar 2008 20:50:45 -0400

In article
<0FF736F1E306A446A88FD41FDDDC10AF1C77B0@BWPW05.f2.enterprise>,  <Erwann.Rogard_at_sanofi-aventis.com> 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

______________________________________________
R-help_at_r-project.org mailing list
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 Sat 22 Mar 2008 - 00:55:33 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Thu 27 Mar 2008 - 17:30:24 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive