From: Dennis Murphy <djmuser_at_gmail.com>

Date: Wed, 25 May 2011 14:50:23 -0700

R-help_at_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. Received on Wed 25 May 2011 - 21:52:05 GMT

Date: Wed, 25 May 2011 14:50:23 -0700

Hi:

On Wed, May 25, 2011 at 12:42 PM, rudi <rudi.strasser_at_gmail.com> wrote:

*> Hi,
**>
*

> can anyone help me to figure out how to compute the percentile of an

*> individual observation with respect to a reference distribution.
**>
**> What I mean is. Let's assume I have a vector consisting of 10 numbers
**> {3,5,8,1,9,5,4,3,5.5,7} and I want figure out what percentile the
**> number 4.9 corresponds to. I failed to find any reference to such a
**> function, although I would assume this must frequently be necessary.
*

The simple answer is, I believe,

x <- c(3,5,8,1,9,5,4,3,5.5,7)

plot(ecdf(x))

sum(x <= 4.9)/length(x)

[1] 0.4

This would correspond to the empirical cumulative distribution function (ecdf) to which Jorge alluded.

**HTH,
**

Dennis

*>
*

> Thanks in advance for you help.

*>
**> /Rudi
**>
**> ______________________________________________
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**> 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.
**>
*

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