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Re: st: Creating choice indicator!


From   Scott Merryman <scott.merryman@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Creating choice indicator!
Date   Tue, 20 Mar 2012 12:27:07 -0500

Something like this?


clear
set obs 5
gen id = _n
expand 5
sort id

bys id: gen order = _n
gen chosen = 0
levelsof id, local(levels)
foreach l of local levels {
	if runiform() < .5 {  //probability that id is chosen
	local a = round(1 +4*runiform(),1)
	qui replace chosen= 1 if order ==  `a' & id == `l' //1 of 5
alternatives is chosen
		
	}
}
drop order
l

Scott


On Tue, Mar 20, 2012 at 11:51 AM, Peter Grand <grand@ihs.ac.at> wrote:
> Dear Statalisters!
>
> How can I create a random binary variable which indicates either only one chosen alternative or none of them within an id variable, e.g. 5 choices for each individual id :
>
>
> id   chosen
> 1       0
> 1       0
> 1       1
> 1       0
> 1       0
> 2       0
> 2       0
> 2       0
> 2       0
> 2       0
> 3       0
> 3       1
> 3       0
> 3       0
> 3       0
>
>
> Thank you very much!
>
> Best,
>
> Peter Grand
> grand(at)ihs.ac.at
> Institute for Advanced Studies
> Stumpergasse 56
> 1060 Vienna
>
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