[R] Obtaining x-values from ECDF

Benjamin Zuckerberg bzuckerb at syr.edu
Sun Nov 18 19:46:34 CET 2007

Dear Group,

I am using the ecdf function as follows:

cawa.cdp <- ecdf(cawaocc$LEFF80)


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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