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st: RE: Trouble with `=`_N'-1'

From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: RE: Trouble with `=`_N'-1'
Date   Mon, 1 Sep 2008 13:35:26 +0200

Stata does not know what to do about `_N', so it evaluates to nothing. The
whole -in- statement evaluates to - in -1 - which denotes the last
observation. Say -replace line = 5 in `=_N-1'- and it works fine. Now _N is
well defined and the expression evaluates to the desired value. Note that
you could have put - in -2 - to begin with, and would have saved yourself
the trouble...


-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Ashim Kapoor
Sent: Monday, September 01, 2008 1:20 PM
To: [email protected]
Subject: st: Trouble with `=`_N'-1'

Hello everyone,

I wish to make a change in the 2nd last observation.

so I have : replace line = 5 in `=`_N'-1'

But this change the LAST observation! Am I doing something wrong?

funnily replace line = 5 if _n==_N-1 works fine!

Any tips?

Thank you,
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