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Re: st: Same condition, different subsamples ??


From   "Seb Buechte" <sfbuechte@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Same condition, different subsamples ??
Date   Tue, 28 Mar 2006 17:26:07 +0200

Akihito,

maybe you could rather send to Statalist the list of Stata commands
you issued than paste some parts of the logfile. Your E-Mail is really
hard to read.

Kind regards,
Sebastian

On 3/28/06, Akihito Tokuhara <akitoku4@hotmail.com> wrote:
> Dear Statalist members,
>
> I have a somewhat weird problem while calculating summary stats with
> sub-samples.
>
> I created a dummy variable, called sme = 1 for small, and sme = 0 for large.
>
> However, when repeating the creation of another dummy variable, Stata 9.0/SE
> seemingly made two different sets of sub-samples. Please see the result from
> the log-files below.
>
> /* ************ */
>
> Three dummy variables are created with identical conditions, but the first
> two
> are calculated by Stata with identical sub-samples. But the third is a
> different
> set of subsample. Hence, the summary stats are different !!
>
> The program was run several times, but they all turned up the same
> difference.
>
> Can anyone enlighten me about this ?
>
> /* ***** From Log Files ******** */
>
> . /* ------------------------------------------------------------ */
> >generate SaleAsst_us=0;        /* -- First dummy -- */
>
> . replace SaleAsst_us=1 if (turn_us < 50000) | (toas_us < 43000);
> (318680 real changes made)
>
> >/* ------------------------------------------------------------ */
> >generate sale_sme=0;           /* -- Second dummy -- */
>
> . replace sale_sme=1 if (turn_us < 50000) | (toas_us < 43000);
> (318680 real changes made)
>
> >/* ------------------------------------------------------------ */
> >/* ----- Check with sub-samples ----- */
> >
> >generate SME=0;                 /* -- Third dummy -- */
> . replace SME=1 if (turn_us < 50000) | (toas_us < 43000);
> (117151 real changes made)
>
> . /*
>
> /* ************* */
> . /* ------------------------------------------------------------ */
> >generate SaleAsst_us = 0;      /* -- First dummy -- */  /* --- space around
> >= --- */
>
> . replace SaleAsst_us = 1 if (turn_us < 50000) | (toas_us < 43000);
> (318680 real changes made)
>
> >/* ------------------------------------------------------------ */
> >generate sale_sme = 0;         /* -- Second dummy -- */
>
> . replace sale_sme = 1 if (turn_us < 50000) | (toas_us < 43000);
> (318680 real changes made)
>
> >/* ----- Check with sub-samples ----- */
> >
> >generate SME=0;                /* -- Third dummy -- */
> . replace SME=1 if (turn_us < 50000) | (toas_us < 43000);
> (117151 real changes made)
>
> . /* ------------------------------------------------------------ */
>
> >/* ---------- For checking sub-sample stats --------------- */
> >  tabstat `varlist1' if (year==2003) & (SME==1) & (quoted=="No"),
> >by(country) stats(n median) column(v
> >ariable) save;
>
> Summary statistics: N, p50
>    by categories of: country
>
>           country |      Var1      Var2      Var3      Var4      Var5
> Var6      Var7      Var8
> -----------------+--------------------------------------------------------------------------------
>           Austria |       286       286       286       319       278
> 318       319       319
>                   |  1.267237  .4993207         0  .4867293       100
> .0693649  .2346598  .0029079
>
> /* ********* */
>
> >/* ---------- For checking sub-sample stats --------------- */
> >  tabstat `varlist1' if (year==2003) & (sale_sme==1) & (quoted=="No"),
> >by(country) stats(n median) col
> >umn(variable) save;
>
> Summary statistics: N, p50
>    by categories of: country
>
>           country |      Var1      Var2      Var3      Var4      Var5
> Var6      Var7      Var8
> -----------------+--------------------------------------------------------------------------------
>           Austria |       280       280       280       313       272
> 312       313       313
>                   |  1.300142  .5070484         0  .4955109       100
> .0687543  .2352267  .0028752
> -
>
> /* ********* */
>
>
> TIA. --- Akihito
>
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>


--
- Seb F Buechte
-
- Stay tuned!

*
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