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

[John Antonakis <john.antonakis@unil.ch>]

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 
> n.j.cox@durham.ac.uk 
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: 17 June 2009 12:18
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: RE: AW: Splitting panel in 3 groups: gen byte
>
> Nick 
> n.j.cox@durham.ac.uk 
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: 17 June 2009 09:15
> To: statalist@hsphsun2.harvard.edu
> 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 
> 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.
>
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>   
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/