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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Winsemius Sent: Friday, March 21, 2008 8:51 PM To: [EMAIL PROTECTED] Subject: Re: [R] difference between 2 ecdfs In article <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]> 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@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. ______________________________________________ R-help@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.
