st: SET MEMORY PROBLEM

[demariaf@unical.it]

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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