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Re: st: AW: Area under a percentile point


From   Jeph Herrin <junk@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: Area under a percentile point
Date   Tue, 03 Feb 2009 09:55:47 -0500


What you want is a bit strange, but here is how I would do it:

 sort myvar
 keep if _n<0.75*_N


hope this helps,
Jeph



zeynep elitaş wrote:
Thanks for help, but this does not solve my problem.  As a simple
example, lets assume we have a data set containing five 6's and five
7's. so the sample size is 10. Now if I wanted to keep the data values
below the 75 th percentile, I would roughly have 7 observations
remaining. However, following your suggestion I end up keeping all the
observations.
Thanks
Zeynep Elitas

2009/2/3 Martin Weiss <martin.weiss1@gmx.de>:
<>

Let`s keep those below the 75 percentile of generated normal deviates...

*************
clear*
set obs 1000
generate x=rnormal()
_pctile x, p(75)
keep if x<=r(r1)
*************



HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von zeynep elitas
Gesendet: Dienstag, 3. Februar 2009 14:28
An: statalist@hsphsun2.harvard.edu
Betreff: st: Area under a percentile point

I have a simple question which I do not have the answer for. Is there
a way to tell Stata to keep the data under a certain percentile point
and drop the rest?  This is important since in my data a percentile
point has often the same value as the ones below and over it.

Thanks
Zeynep Elitaş

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