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


From   Joerg Luedicke <joerg.luedicke@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Questions for random data generation and value label
Date   Mon, 11 Mar 2013 13:48:37 -0400

The normal distribution has support -infinity,+infinity, so it is not
clear what you mean with 'range' here. Do you want to draw from a
truncated normal distribution?

Joerg

On Mon, Mar 11, 2013 at 12:49 PM, Yu Xue <snowrain@gmail.com> wrote:
> 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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