st: Re: Memory problems when creating a spatial weight matrix

["Michael Blasnik" <michael.blasnik@verizon.net>]

You need to give us more information about your dataset, operating system, etc. 
The 940m should be plenty of room for a 500 observation dataset and an 800x800 
matrix.  Can you describe your dataset in more detail?  Do you have hundreds of 
long string variables?  Is there a way for you to encode any long strings and 
compress other variables?  In terms of accessing more memory -- what OS are you 
using?  If MS Windows XP, have you tried the memory hotfix described here 
http://www.stata.com/support/faqs/win/winmemory.html?

Michael Blasnik

----- Original Message ----- 
From: "Lina Jonsson" <lina.jonsson@vti.se>
To: <statalist@hsphsun2.harvard.edu>
Sent: Friday, September 21, 2007 5:25 AM
Subject: st: Memory problems when creating a spatial weight matrix



> Dear statalisters.
>
> I am working with a hedonic price study where I whould like to check for
> and correct for spatial autocorrelation. For this I whould like to
> create a spatial weight matrix based on the x- and y-coordinates for
> each house using the spatwmat-command in spdep. Since I have Intercooled
> Stata the maximum matsize that I can set is 800, which means that I can
> use no more than 800 observations. But since I cannot set memory to more
> than 940m, the actual numbers of observations that I can use is less
> than 500. This is to few.
>
> After reading some old questions concerning memory problems I realize
> that this might be a problem that is hard to solve.
> Does any of you have any suggestions on how I can increase the memory in
> Stata. Can increasing the RAM-memory on my computer help? Or is it
> unrealistic to think that it will be possible to create a matrix whith
> the spatwmat-command that will be almost 8000x800 on a "standard"
> computer? Should I change to some other software and what in that case?
>
> I am greatful for any suggestions!
>
> /Lina Jonsson
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