On Jan 11, 2012, at 8:12 AM, Martin Batholdy wrote:
Hi,
I have a vector with values:
x <- rnorm(1000, 5, 2)
and one single value:
y <- 6.2
now I would like to know the percent rank of y based on the
'population'-vector x.
Is there a convenient function that calculates the percent rank of a
y for the given vector x?
Two options :
1) sort x and use findInterval, divide the index by length(x) and
multiply by 100
(It can all be done as a one-liner.)
2) I generally "reach for" the `ecdf` "function making machine" when I
see sample quantile problems and see if I can cast the problem in
terms for which it applies.
For my random draw I get:
> findInterval(6.2, sort(x))
[1] 704
> xecdf <- ecdf(x)
> xecdf(6.2)
[1] 0.704
--
David Winsemius, MD
West Hartford, CT
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