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st: RE: mat size


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: mat size
Date   Wed, 1 Nov 2006 13:45:39 +0100

Ines:
Apparently you are trying to estimate a fixed effects regression by adding 
dummies. A better way of doing the fixed effects regression is -xtreg- with 
the fe option. see: -help xtreg- and the entry for -xtreg- in the xt manual.

HTH,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of irodriguez
Sent: woensdag 1 november 2006 13:33
To: statalist@hsphsun2.harvard.edu
Subject: st: mat size

Dear list-members,

I am trying to run a OLS regression with panel data (8240 observations) 
The explaining variable have 1203 categories

I estimate the following model:
    set mem 50m
    set matsize 800
    xi: reg perform i.codempr
but the outcome is:

i.codempr         _Icodempr_1-1203    (naturally coded; _Icodempr_1 omitted)
matsize too small
    You have attempted to create a matrix with more than 800 rows or columns
or to fit a model with more than 800
    variables plus ancillary parameters.  You need to increase matsize using
the set matsize command; see help matsize.
r(908);


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