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Re: st: RE: Smallest observation


From   n j cox <n.j.cox@durham.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Smallest observation
Date   Thu, 30 Mar 2006 14:30:44 +0100

Not quite.

bysort indiv (year) : gen byte index = _n != 1

The sorting by individuals doesn't guarantee
year order within panels.

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

Scott Merryman

bysort indiv: gen byte index =_n != 1

Carl Nelson

> I am trying to create an index for each individual in an
> unbalanced panel. The index should take the value 0 for the
> first time series observation for the individual and 1 for
> all other values.
>
> My problem is that I can't find the right syntax to replace
> the index with 0 if this is the first time series
> observation. How do I refer to the smallest observation in a
> conditional statement?
>
> gen s = 1
> bysort indiv: rep s = 0 if year == smallest(year)?
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