So
. tab rep78, subpop(foreign)
. tab rep78 if !foreign
is a way of getting something like
. bysort foreign: tab rep78
_and_ also getting explicit zeros.
However, that appears to hinge on a quirk of those variables,
i.e. the fact that _all_ the values of -rep78- occur for -foreign
== 0-.
To expand on Michael's point, for two categories,
you'd usually need something like
gen domestic = !foreign
tab rep78, subpop(foreign)
tab rep78, subpop(domestic)
In general, you need a dummy for
each category -- and you can get them as a side-effect
of -tabulate- -- but the display wouldn't be very attractive in
any case.
No doubt, -, subpop()- solves the problem it was designed
to solve, but it doesn't really extend easily to the problem
I have in mind, wanting explicit zeros in each case.
Nick
[email protected]
Michael Blasnik
>
> 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.
>
> > 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.)
> >
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