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Re: st: Simulation question.


From   smerryman@kc.rr.com
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Simulation question.
Date   Thu, 03 Feb 2005 08:07:20 -0600

----- Original Message -----
From: adiallo5@worldbank.org
Date: Thursday, February 3, 2005 7:32 am
Subject: st: Simulation question.

> Hi,
> 
> I have a simulation problem.
> 
> Usually, what I've seen done in simulations is to change
> values in independent variables and see their result on the
> (predicted dependent variable).
> 
> Ex:
> 
> reg GDP pop invest
> predict gdphat
> su gdphat
> replace pop =pop * 1.03                                 /* 3% 
> growth of
> population*/
> predict gdphat2
> su gdphat2
> g diff = gdphat - gdphat2                                   
> /*Measure of the
> impact of the population growth */
> 
> Now, here is my question:
> 
> Suppose I want to double  my GDP ?
> I am interested in how my independent variables will change (in their
> coeffcients and/or in their observations ???)
> to meet the new values of GDP.

If you change your model to -reg 2*gdp pop invest- the estimated coefficients
and standard errors will be twice as large as before.

Scott


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