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st: what's wrong with this statement?

From   Jeph Herrin <>
Subject   st: what's wrong with this statement?
Date   Tue, 23 Sep 2008 14:15:51 -0400

I've done this many times (in the past) to identify duplicate records;
I've typed and retyped this several times. What's going wrong?

. bys faccode pat_mrn admit_datetime discharge_datetime: gen dups=_N

. tab dups
variable dups not found

Notice, the first line does NOT produce an error. However, it also
does not produce a new variable!

Thanks in advance for pointing out what must be an obvious error.


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