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Re: st: Confirming whether a variable is binary or continuous


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Confirming whether a variable is binary or continuous
Date   Sat, 17 Mar 2012 07:05:00 +0000

Variations on this are often used inside Stata commands

sort var
assert var == var[1] | var == var[_N]

Here -var- must be one of two distinct values, but nothing specifies
what they are precisely.

Nick

On Fri, Mar 16, 2012 at 11:39 PM, daniel klein
<klein.daniel.81@googlemail.com> wrote:
> Nick,
>
> very smart solution, thanks. Seems it is often the simple solutions
> that are so hard to find.
>
> The difference to the "-tabulate- solution" is that <var> is allowed
> to be a constant here, which is perfectly alright for a binary
> variable. It is for Bert to decide whether the indicators are allowed
> to be constant or have to vary.
>
> Daniel
>
> --
> You can also do this by e.g.
>
> assert inlist(var, 0. 1)
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