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Re: st: re: data management


From   "Sergiy Radyakin" <serjradyakin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: re: data management
Date   Thu, 27 Mar 2008 17:47:20 -0400

On 3/27/08, Kit Baum <baum@bc.edu> wrote:
> Raphael said
>
> I have 100 subjects with 6 obs each. I would like to create a new
> variable containing 1s for the first three obs and 2s for the
> remaining obs for each id.
>
>
> bysort id: gen x = cond( _n < 4, 1, 2)

and this raises the question, is _bysort_ stable? Because if it is
not, then not the first three of Raphael's observations get 1s, but
three random of each six get 1s. Stata's manual is silent about it,
but it seems to be the case. Quote:

"sort specifies that if the data are not already sorted by varlist, by
sort them."

Does anybody have more precise info? Is bysort stable?

Regards, Sergiy


>
>
>
>
> Kit Baum, Boston College Economics and DIW Berlin
> http://ideas.repec.org/e/pba1.html
> An Introduction to Modern Econometrics Using Stata:
> http://www.stata-press.com/books/imeus.html
>
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