[R] Help - Probability scale on an ECDF plot

[Don MacQueen]

You need to tell the mailing list what you have tried. That way you 
will get better help.

Here is one solution.

>  foo <- rnorm(1000)
>  probs <- seq(0,1,.1)
>  foo <- rnorm(1000)
>  bah <- quantile(foo,probs)
>  plot(bah,probs)

But it turns out that
    ?ecdf
tells you there is an ecdf function. And then
    plot(ecdf(foo))
gives an ECDF plot with a probability scale on the y axis.
(So it's hard to imagine what you were doing that didn't give you a 
probability axis)

-Don


At 5:22 PM -0700 10/27/09, Jessica Goin wrote:
>Hello;
>
>Can anyone tell me how to set my y-axis to a probability scale on an ECDF
>plot?  Or alternatively, how to generate a plot of percent cumulative
>probability against concentration?  DASplusR does this and calls it a CP
>plot, but I would like to be able to generate this outside of DASplusR-
>
>Thank you!
>
>	[[alternative HTML version deleted]]
>
>______________________________________________
>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.


-- 
---------------------------------
Don MacQueen
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
macq at llnl.gov