# Re: st: constrained sum of random values

 From Eva Poen To statalist@hsphsun2.harvard.edu Subject Re: st: constrained sum of random values Date Wed, 25 Mar 2009 19:12:46 +0000

```<>

I just saw Nick's reply which is much better. I suggest you use his.
Eva

2009/3/25 Eva Poen <eva.poen@gmail.com>:
> 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?
>>
>>
>> Kind Regards,
>> Carlo
>>
>
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