> x <- rpois(50, 10) > which(x <= quantile(x, 0.2)) [1] 7 14 16 24 25 28 33 44 45 48 > x[which(x <= quantile(x, 0.2))] [1] 6 5 4 5 7 7 4 5 6 7 > quantile(x, 0.2) 20% 7.8
HTH, Dennis On Thu, Jul 28, 2011 at 9:42 PM, Jim Silverton <jim.silver...@gmail.com> wrote: > I have a vector of numbers, and I will like to find the positions of the > lowest 20% of the values. Can anyhow point out how to do this. I tried the > ecdf function but to no avail. > > > > -- > Thanks, > Jim. > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. > ______________________________________________ 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.