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


From   John Antonakis <[email protected]>
To   [email protected]
Subject   Re: st: FW: RE: RE: AW: Splitting panel in 3 groups: gen byte
Date   Wed, 17 Jun 2009 19:38:21 +0200

Dear Nick and Martin:

Thank you so much for the helpful tips and explanations--as well as the elegant solutions, which work nicely.

Best,
J.

____________________________________________________

Prof. John Antonakis
Associate Dean Faculty of Business and Economics
University of Lausanne
Internef #618
CH-1015 Lausanne-Dorigny
Switzerland

Tel ++41 (0)21 692-3438
Fax ++41 (0)21 692-3305

Faculty page:
http://www.hec.unil.ch/people/jantonakis&cl=en

Personal page:
http://www.hec.unil.ch/jantonakis
____________________________________________________



On 17.06.2009 16:09, Nick Cox wrote:
<> Remember to set the seed for repeatability. Nick [email protected]

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nick Cox
Sent: 17 June 2009 12:18
To: [email protected]
Subject: st: RE: RE: AW: Splitting panel in 3 groups: gen byte

Nick [email protected]

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nick Cox
Sent: 17 June 2009 09:15
To: [email protected]
Subject: st: RE: AW: Splitting panel in 3 groups: gen byte

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 [email protected]
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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