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st: RE: AW: Splitting panel in 3 groups: gen byte


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: AW: Splitting panel in 3 groups: gen byte
Date   Wed, 17 Jun 2009 09:15:02 +0100

With three or more groups, it is perhaps easier to move to 

gen random=runiform()
sort i random
by i: gen byte group = ceil(3 * _n/_N) 

"for any value of 3" (hoary mathematical joke) 

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

Martin Weiss

Also note Nick`s http://www.stata.com/support/faqs/stat/sampling.html

John Antonakis

Martin recently helped with me with some code, to randomly split panel 
data equally into two groups (which I then collapsed afterwards).

I am trying to understand the code regarding the split. My panel 
identifier is "i".

I had:

gen random=runiform()
sort i random
by i: gen byte group=cond(_n<=_N/2,1,2)

So, how to I split into 3 groups or 4 groups?  I am not sure what the 
"gen byte" command does and how the numbers 2,1,2 relate to the command.

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