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# Re: st: random sampling matching the characteristics of the sample

 From Andrea Rispoli To statalist@hsphsun2.harvard.edu Subject Re: st: random sampling matching the characteristics of the sample Date Tue, 1 May 2012 09:22:04 +0100

```Dear Stan,
Thank you. This is the request of a reviewer. Would you recommend that
I simply chose a random sample?

On Tue, May 1, 2012 at 3:13 AM, Stas Kolenikov <skolenik@gmail.com> wrote:
> So why exactly do you want to do this? You will only lose in
> precision, provided your model is OK; if it is badly misspecified,
> then God only knows how your coefficients could jump around, so you
> probably should not trust either specification, anyway.
>
> On Mon, Apr 30, 2012 at 6:44 PM, Andrea Rispoli <andrea.rspl@gmail.com> wrote:
>> Dear Statalisters,
>> I am running a regression model: y=f(x, age, size) where x is a dummy
>> variable that can take value 1 or 0.
>> Since in my sample x=1 for 10% of the sample and x=0 for 90% of the
>> sample, I would like to identify a random subsample among the group
>> x=0 so that it is more "comparable" in terms of size with the
>> subsample for which x=1.
>>
>> My problem is that I would like that the selected subsample (in which
>> x=0) matched the characteristics of the first subsample (x=1) on the
>> other dimensions (e,g age and size).
>> For instance, if I take the subsample x=1, mean of age = 37, mean of size=45.
>> I would like to randomly select the second subsample (x=0), so that
>> mean of age = 37, mean of size=45 as it is the case in the first
>> subsample (x=1).
>>
>> Do you have any suggestions on how I could achieve such result in stata?
>>
>> Kind Regards
>> *
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>
>
>
> --
> Stas Kolenikov, also found at http://stas.kolenikov.name
> Small print: I use this email account for mailing lists only.
>
> *
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> *   http://www.ats.ucla.edu/stat/stata/

*
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```