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Re: st: RE: tab


From   "Michael Blasnik" <michael.blasnik@verizon.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: tab
Date   Thu, 11 Dec 2003 11:38:50 -0500

tab rep78, subpop(foreign)

will do it directly.  It isn't always as convenient, sometimes you need to
create a dummy variable for your subpop to get exactly what you want.

Michael Blasnik
michael.blasnik@verizon.net


----- Original Message ----- 
From: "Nick Cox" <n.j.cox@durham.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Thursday, December 11, 2003 11:01 AM
Subject: RE: st: RE: tab


> Thanks for the reference to -, subpop()- which
> somehow has never registered with me; indeed
> I don't think I ever understood it.
>
> Here is the sort of example I had in mind. Some
> people would like explicit zeros in the case
> of rep78 == 1, 2 & foreign == 1. Can -, subpop()-
> help here, directly, without changing the dataset?
>
> (This was one motivation for writing -tabcount-,
> now on SSC. I thought that such tables should be
> possible on the fly, so far as the user is
> concerned.)
>
<snip>>

> Nick
> n.j.cox@durham.ac.uk
>
> > >2. -tabulate- is reluctant to tabulate classes which
> > >don't exist in the data. In particular, you can't
> > >get zero counts out of -tabulate <myvar>-.
> >
> > -tabulate- can give zero counts, using the -subpop(...)- option.
> >
> > If var2 restricts the dataset so as to exclude some of the
> > values of myvar,
> > then
> >
> >   tabulat myvar, subpop(var2)
> >
> > will have zero entries for the values in question.
> >
> > (And presumably, this would hold under -if- or -in-
> > restrictions, as long
> > as var2 further restricts the dataset so as to exclude some
> > values of myvar.)
> >
> > If you really want to see some nonexistant values in a
> > -tabulate-, you can
> > extend the dataset to include them, and then create a
> > variable that serves
> > as an indicator for the "actual" data. Then present that
> > variable in the
> > -subpop(...)- option.


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