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

 From Stas Kolenikov To statalist@hsphsun2.harvard.edu Subject Re: st: random sampling matching the characteristics of the sample Date Mon, 30 Apr 2012 21:13:14 -0500

```So why exactly do you want to do this? You will only lose in
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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```