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Re: st: constrained sum of random values


From   Eva Poen <eva.poen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: constrained sum of random values
Date   Wed, 25 Mar 2009 19:11:46 +0000

Carlo,

If you put such a constraint on your random values, it means that at
most 76 of them can be random; you need one value to bring the sum up
to 9900. This is very simple to do:

clear
set obs 77
set seed 123
gen n = rnormal(125,25) in 1/76
qui sum n
replace n = 9900-r(sum) in 77


You didn't mention what kind of random values you want, i.e. which
distribution. I assumed normal distribution with mean 125 and sd of
25.

Eva


2009/3/25 Carlo Lazzaro <carlo.lazzaro@tiscalinet.it>:
> Dear Statalisters,
> is there any way for imposing Stata 9.2/SE to create a variable composed of
> 77 random values so that the sum of these random values is 9900?
>
> Thanks a lot for your kindness and for your time.
>
> Kind Regards,
> Carlo
>
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