May be this one will be easier?
generate Kreis=int(uniform()*439+1)
recode Kreis (1=10000 2=10010 3=10020 ....)
Not sure if all Kreise are equal in population though (this is what
uniform implies). You might want to weight the things somehow or
consider other distributions.
Regards,
Sergiy Radyakin
On 8/15/08, Jochen Sp�th <[email protected]> wrote:
> Hello Martin,
>
> thanks a lot. Your suggestion is more or less what I need. The problem is only that my list contains 439 numbers of the German Kreise, so following your suggestion I would have to divide the 0-1 interval which is used by the -runiform- command into 439 equal parts and tell Stata manually to assign those 439 numbers. But for the first trials this will do.
>
> Thanks,
> Jochen
>
> -------------------------------------------------------------------------------------------
>
> Jochen Sp�th
>
> Dipl.-Volkswirt
>
> Institut f�r Angewandte Wirtschaftsforschung (IAW) T�bingen
>
> Ob dem Himmelreich 1
>
> 72074 T�bingen
>
> Tel.: +49-(0)7071-9896-14
>
> Fax: +49-(0)7071-9896-99
>
> EMail: [email protected]
>
> IAW-Homepage: www.iaw.edu
>
> -------------------------------------------------------------------------------------------
>
>
>
>
> -----Urspr�ngliche Nachricht-----
> Von: [email protected] im Auftrag von Martin Weiss
> Gesendet: Fr 15.08.2008 17:38
> An: [email protected]
> Betreff: st: RE: generating random numbers from a specified list
>
> The problem is not entirely clear to me, but sounds like a case for nested
> -cond- statements as in
>
> ********
> clear*
> set obs 10000
> g x=cond(runiform()<0.3, 10000, cond(runiform()<0.6, 10010,
> cond(runiform()<0.9,10020, 10030)))
> *******
>
> where x is drawn from (10000,10010,10020,10030) and you can specify the
> probabilities for the runiform() function as you please...
>
> HTH
> Martin
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Jochen Sp�th
> Sent: Friday, August 15, 2008 5:21 PM
> To: [email protected]
> Subject: st: generating random numbers from a specified list
>
> Dear statalisters,
>
> trying to build up a new dataset which is (almost) entirely random I'm
> confronted with the following problem: How can I tell Stata to generate a
> variable by randomly picking numbers from a (previously) specified list?
> Here's a minimal example of what I want to do:
>
>
> Data right looks like follows:
>
> firm year az_ges az_ges_vz
> 1000129 1975 15 11
> 1000129 1976 14 11
> 1000129 1977 8 6
> 1000129 1978 26 20
>
> 1000530 1993 12 9
> 1000530 1994 29 22
> 1000530 1995 26 20
> 1000530 1996 14 11
> 1000530 1997 18 14
>
> and so on, where firm is the cross section identifier and year the time
> variable. Note that data ist organised in long format.
> Now, I'd like to add a variable which contains for each firm a number picked
> at random from a specified list, f.i. list=(10000,10005,10010, and so on).
> This "random" number should be the same for firms across years. The list
> exists already, albeit in a separate data file that can't be merged with the
> data set at hand because it lacks the identifiers betnr and year.
>
> Any suggestions?
>
> Thanks,
>
> Jochen
>
> ----------------------------------------------------------------------------
> ---------------
>
> Jochen Sp�th
> Dipl.-Volkswirt
> Institut f�r Angewandte Wirtschaftsforschung (IAW) T�bingen
> Ob dem Himmelreich 1
> 72074 T�bingen
> Tel.: +49-(0)7071-9896-14
> Fax: +49-(0)7071-9896-99
> EMail: [email protected]
> IAW-Homepage: www.iaw.edu
>
> ----------------------------------------------------------------------------
> ---------------
>
>
>
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