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Re: st: Questions for random data generation and value label


From   Yu Xue <snowrain@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Questions for random data generation and value label
Date   Mon, 11 Mar 2013 11:49:32 -0500

Thanks Maarten!

What I want is Normal Distribution. Is there a way to randomly
generate a variable with specific mean, SD, and range,

Thanks!!
Mark

On Mon, Mar 11, 2013 at 10:35 AM, Maarten Buis <maartenlbuis@gmail.com> wrote:
> On Mon, Mar 11, 2013 at 4:20 PM, Yu Xue wrote:
>> I already checked "-help random_number_functions-", but I still can
>> not find the answer to my question.
>>
>> I knew that I can use a formula similar like this:
>> Var=a+int((b-a+1)*runiform()), to keep a specific range in [a,b]
>> and use another formula: Var=invnorm(uniform())*SD+mean, to keep
>> specific Standard deviation and mean.
>> But I do not know how to generate a "Var" with all specific range, SD, and mean.
>> Please note that I do not generate a sample data from the actual data,
>> what I want to generate is synthetic data (totally fake data).
>
> What distribution do you want to draw your new variable from? Do you
> want it to be normally (Gaussian) distributed, gamma distributed, beta
> distribed, Fisk distributed, Laplace distributed, ... The number of
> choices is huge, but without choosing your distribution you cannot
> draw your random numbers.
>
> -- Maarten
>
>
> ---------------------------------
> Maarten L. Buis
> WZB
> Reichpietschufer 50
> 10785 Berlin
> Germany
>
> http://www.maartenbuis.nl
> ---------------------------------
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