st: Re: SET MEMORY PROBLEM

["Steven Proud" <steven_proud@hotmail.com>]

I'm assuming you're using intercooled stata, so there is a maximum of 2,048 
variables

Probably best to try
set matsize 800

If not,

set mem 2g

If you're struggling, it's possible to use the virtual memory more 
efficiently

set virtual on
**********************************************
----- Original Message ----- 
From: <demariaf@unical.it>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, December 04, 2007 2:46 PM
Subject: st: SET MEMORY PROBLEM



> Hi everyone,
>
> I have a big database in which the number of rows is equal to 6519324  and 
> the number of column is approximate to 170 (including fixed  effects), and 
> I have 5 years.
> My model is the following:
> I estimate:
> lnX_ij=�+�_1 lnY_i+ �_2 lnY_j +�_3 lnPOP_I+�_4 lnPOP_J+�_5lnD_ij+�ij
>
> to estimate this model I have to use a poisson.
>
> when I use all years I get following message:
>
> no room to add more variables due to width
>     An attempt was made to add a variable that would have increased  the 
> memory required to store an observation beyond what is currently 
> possible.  You have the following alternatives:
>      1.  Store existing variables more efficiently; see help compress.
>      2.  Drop some variables or observations; see help drop.  (Think  of 
> Stata's data area as the area of a rectangle; Stata can trade off  width 
> and length.)
>      3.  Increase the amount of memory allocated to the data area  using 
> the set memory command; see help memory.
>
> Instead when I use just one  year I get next message:
> matsize too small
> You have attempted to create a matrix with more than 300 rows or  columns 
> or to fit a model with more than 300 variables plus ancillary  parameters. 
> You need to increase matsize  using the set matsize  command; see help 
> matsize.
>
> I have tried to set Stata memory in different ways, instance:
> set matsize 500
> set maxvar 2048
> set memory 1350m
>
> but stata doesn't work yet. My laptop has the following characteristics:
> RAM 2047 MB
> SYSTEM 32 BIT AND PROCESSOR CPU INTEL CORE 2 T7400@2.16 GHz
>
> what can I do?
>
> Thanks
>
> federica
>
>
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