[R] Extracting x-values from an ecdf
Benjamin Zuckerberg
bzuckerb at syr.edu
Fri Nov 16 19:08:48 CET 2007
Dear R users,
Quick question on the use of ecdf for producing a cumulative
distribution function.
After having produced a cumulative distribution using ecdf, I would
like to extract the exact x-value for a given percentile. For example
I can ascertain the 1st and 3rd quartile using the summary function:
cawa.cdp <- ecdf(cawaocc$LEFF80)
plot(cawa.cdp, ylab="Fn(x)")
summary(cawa.cdp)
But, I would like write a function so that I can produce multiple
ecdfs for >100 separate distributions and then extract the x-value (in
this case LEFF80) for a given percentile (e.g., 80) for each separate
distribution. Then I could produce an average x-value for all the
distributions for a given percentile. I hope this is not too
confusing. Thank you for the help!
--
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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