# Re: st: AW: Area under a percentile point

 From Antoine Terracol To statalist@hsphsun2.harvard.edu Subject Re: st: AW: Area under a percentile point Date Tue, 03 Feb 2009 16:19:13 +0100

```Just make sure to drop all observations with missing values of myvar
before applying Jeph's trick

Antoine

zeynep elitaº wrote:
> It looks like it'll work just fine
> 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 elitaº 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 Elitaº
>>>>
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