[R] Obtaining x-values from ECDF

[Henrique Dallazuanna]

try this:

knots(cawa.cdp)

-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O


On 18/11/2007, Benjamin Zuckerberg <bzuckerb at syr.edu> wrote:
>
> Dear Group,
>
> I am using the ecdf function as follows:
>
> cawa.cdp <- ecdf(cawaocc$LEFF80)
>
> summary(cawa.cdp)
>
> Empirical CDF:    223 unique values with summary
>     Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
> 0.07918 1.35700 1.68600 1.61000 1.91200 2.70000
>
> I can see by the summary that the y-value for the 3rd quartile is 1.912.
>
> How can I obtain the x-value for a specified y-value (e.g., 0.8)?
>
>
> Thank you!
>
>
> --
> Benjamin Zuckerberg
> Doctoral Candidate
> State University of New York
> College of Environmental Science and Forestry
> Illick 244A, 1 Forestry Drive
> Syracuse, New York 13210
> Tele: (315) 470-6985
> E-mail: bzuckerb at syr.edu
>
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