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Re: st: AW: Area under a percentile point


From   zeynep elitaş <zelitas@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: Area under a percentile point
Date   Tue, 3 Feb 2009 17:03:49 +0200

It looks like it'll work just fine
Thanks for your time
Zeynep Elitas

2009/2/3 Jeph Herrin <junk@spandrel.net>:
>
> 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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