Re: st: how to obtain random sample of dichotomous (0,1) variable

["Viktor Slavtchev" <viktor.slavtchev@uni-jena.de>]

Thanks a lot, Maarten
vik


Am 27 Apr 2007 um 14:51 hat Maarten buis geschrieben:

> --- Viktor Slavtchev <viktor.slavtchev@uni-jena.de> wrote:
> > how can I create a random sample of size N of discrete (dichotomous)
> > variable (0=no; 1=yes)?
> 
> You can use function uniform(), which will create a random draw from a
> uniform distribution between zero and one, so all values between zero
> and one are equally likely to be returned. So 50% of the cases in a
> variable created with uniform() will contain a value less than .50, 60%
> will contain a value less than .60, etc.
> 
> *----------- begin example ------------
> local N = 500
> set obs `N'
> 
> /*For a fixed probability, say 50%*/
> gen yes = uniform() < .5
> 
> /*For a probability that depends on x 
> through a logistic regression equaiton */
> 
> gen x = invnorm(uniform())
> gen y = uniform() < invlogit(-1 + x) 
> *--------------- end example --------------
> (For more on how to use examples I sent to the Statalist, see:
> http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
> 
> Hope this helps,
> Maarten
> 
> 
> 
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
> 
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434
> 
> +31 20 5986715
> 
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
> 
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