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RE: st: Select observations within variable


From   "Nikolaos Kanellopoulos" <nkkanel@yahoo.gr>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Select observations within variable
Date   Mon, 26 Feb 2007 23:11:39 -0000

Nick and Austin,

Thank you very much for your help.

Regards
Nikos 

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Monday, February 26, 2007 9:51 PM
To: statalist@hsphsun2.harvard.edu
Subject: RE: st: Select observations within variable

Alternatively, check out -tsspell- from SSC. 

Nick
n.j.cox@durham.ac.uk 

Austin Nichols
 
> Like so?
> bys i (t): gen red2=sum(x<x[_n-1] & _n>1)>0
 
Nikolaos Kanellopoulos 

> > I have a very common panel data set. i is my individual
> identifier, t my
> > time variable and x is a categorical variable. I want to
> create a variable
> > that will be 1  for all the observations of the same
> individual after x is
> > reduced. ie I want to identify all the observations for the
> same individual
> > after a reduction on x has taken place. Note that a
> reduction does not
> > happen to all individuals.

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