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Re: st: Monte Carlo with preset spatial autocorrelation


From   Austin Nichols <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Monte Carlo with preset spatial autocorrelation
Date   Mon, 11 May 2009 15:49:04 -0400

Susan Olivia <olivia@primal.ucdavis.edu>:
Note that the top of that page says the "FAQ is for users of Stata 6,
an older version of Stata. It is not relevant for more recent
versions." See -help drawnorm- for the modern equivalent.  If you can
give the relevant matrix of correlations or covariances, the rest is
easy.  What does your "pre-determined weighting matrix" look like?

On Mon, May 11, 2009 at 3:39 PM, Susan Olivia <olivia@primal.ucdavis.edu> wrote:
> Dear Stata list,
>
> I am wondering whether it is possible to generate artificial
> data with a given strength of spatial autocorrelation (for a
> pre-determined weighting matrix)?
>
> I found on the STATA archive that Bill Gould wrote some code
> about generating a random variable with a given correlation
> structure. Here's the url:
>
> http://www.stata.com/support/faqs/stat/mvnorm.html
>
> But to do this in a spatial context would seem to be more
> complicated given that the spatial autocorrelation will
> depend not not only on the own and neighboring values, but
> also how far apart they are place.
>
> If I can get any programming tips on this, much appreciated.
>
> Thanks,
>
> Susan
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