On Mar 3, 2012, at 13:37 , drflxms wrote: > Dear all, > > I am familiar with obtaining the value corresponding to a chosen > probability via the quantile function. > Now I am facing the opposite problem I have a value an want to know it's > corresponding percentile in the distribution. So is there a function for > this as well?
For a single value, mean(x <= a) will do. Otherwise check ecdf(). > x <- rnorm(100) > mean(x <= 2) [1] 0.97 > ecdf(x)(2) [1] 0.97 > ecdf(x)(-3:3) [1] 0.00 0.01 0.14 0.48 0.80 0.97 1.00 if you need values for your original data points, rank(x)/length(x) should do (bar missing value issues). > > Thank you for your support in advance, Felix > > ______________________________________________ > R-help@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. -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@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.
