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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