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From |
"Martin Weiss" <[email protected]> |

To |
<[email protected]> |

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

Date |
Mon, 1 Sep 2008 18:02:57 +0200 |

```
On that point: while writing my post, I dodged the question of how to call
_N by its name. I probably should have said "system variable", as in -h
_variables-...
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nick Cox
Sent: Monday, September 01, 2008 5:51 PM
To: [email protected]
Subject: st: RE: RE: Trouble with `=`_N'-1'
Just to underline Martin's analysis: the reference `_N' would be
appropriate if _N were the name of a local macro, but _N is not a local
macro.
Nick
[email protected]
Martin Weiss
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...
Ashim Kapoor
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!
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```

**References**:**st: Trouble with `=`_N'-1'***From:*"Ashim Kapoor" <[email protected]>

**st: RE: Trouble with `=`_N'-1'***From:*"Martin Weiss" <[email protected]>

**st: RE: RE: Trouble with `=`_N'-1'***From:*"Nick Cox" <[email protected]>

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