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re: Re: st: How to deal with r(909) "op. sys. refuses to provide


From   Christopher Baum <kit.baum@bc.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   re: Re: st: How to deal with r(909) "op. sys. refuses to provide
Date   Sun, 9 Dec 2012 13:57:18 +0000

<>
You have 4 Gb of RAM, but it's typical that Windows only provides
about half to Stata. You need more RAM, i.e. a hardware change, to run
precisely this model. Otherwise you try using fewer groups or shutting
other applications (which probably won't make much difference).

Nick

On Sun, Dec 9, 2012 at 10:28 AM, Murod Aliyev <ma.statalist@yahoo.com> wrote:

> I have read a lot of threads on this issue, but still can not resolve my problem:
>
> I am trying to run FGLS (xtgls) with 49,000 observations, 8 years unbalanced panel with around 7,500 groups, 26 varibles in the model.
> After first trying xtgls I get a message saying "matsize too small - should be at least 7369". So, I set matsize to 8000, then I get a message r(909) "op. sys. refuses to provide memory". Could you please help me understand what is causing the problem here, and how to reslve it? I presume it is not related to the number of observations or variables, but rather caused by the way FGLS works.
>
> Resources in use:
>
> - 32 bit Windows 7
> - RAM 4g
> - Stata/SE 12.1
> - Stata "About" shows Available Physical Memory 1,945,452 KB
> - max_memory set to .
>


It doesn't matter how much RAM you have; on a 32-bit machine you cannot access more than ~2 Gb. You need 64-bit hardware (which presumably you have already) and a 64-bit version of Windows 7. Stata will then be able to access whatever RAM you have (subject to the caveat above, that only about half will be available to a given app).

Kit


Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
                             An Introduction to Stata Programming  |   http://www.stata-press.com/books/isp.html
  An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html


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