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st: RE: if qualifier


From   "Sarah Edgington" <[email protected]>
To   <[email protected]>
Subject   st: RE: if qualifier
Date   Wed, 10 Jul 2013 13:15:33 -0700

Elan,
It appears to be just ignoring the <20.
That is, it's that same result as -count if 10<mpg-
I'm also surprised it doesn't give an error (I'd expect "invalid <20").
-S

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Cohen, Elan
Sent: Wednesday, July 10, 2013 12:24 PM
To: [email protected]
Subject: st: if qualifier

All,

I'm not sure what to make of the following:

sysuse auto
count if 10<mpg<20

A SAS-using colleague of mine typed this into Stata.  Much to her
astonishment, it returned a valid yet incorrect answer.  Much to my
astonishment, it did not return an error.

What is Stata doing here?  Is this behavior documented anywhere?

- Elan


--
Elan D Cohen, MS
Center for Research on Health Care Data Center University of Pittsburgh 



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