difference between 2 ecdfs

In article 
<0FF736F1E306A446A88FD41FDDDC10AF1C77B0 at BWPW05.f2.enterprise>,

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

Hello ,

    Can anyone please help me figure out how to do a weighted betabinomial
   analysis?  I  mean i have 700 clusters each of size 2 and the response
   (y[i1]+y[i2]) in each cluster case is either 0,1 or 2. I extract a sample of
   clusters such that the clusters in which response is 1 or 2 have higher
   probability of selection but clusters in which response is 0 have lower
   probability of selection. Now i want to give weight to my sample before i
   apply betabinomial model to the sampled clusters. what should i do?

   I would really appreciate any help  specially from the authors of package
   "aod "  it would be great if they could tell if it is possible to give some
   option of weights to "betabin" function like we give in glm function?

   looking forward for help .

   thanks!

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>,

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.

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

> 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>,

>
   > > 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.
   >
   > ______________________________________________
   > 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.