> 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.silverton at
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.
>
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>
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