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RE: st: tab for 3x3


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: tab for 3x3
Date   Tue, 3 Jul 2007 15:02:23 +0200

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

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434 

+31 20 5986715

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


> > An alternative is a loglinear model,
> > that is, the log cell frequency is a function
> > of the covariates mapped to dummy variables.
> > That would be most easily done with -glm-
> > or -poisson- after a -contract-. That
> > might be a sledgehammer, but it's a systematic
> > approach.

--- Lord Yupa wrote:
> I'm interested in such a problem too; i used to aggregate the data
> creating 2x2 tables, but this is a workaround (with many cons and few
> pros) and not a systematic approach.
> 
> Please, could you make an example using glm for such analysis?

example is my middle name (actually it is Leendert)

*----------- begin example -------------
sysuse auto, clear
recode rep78 1/2 = 3
keep if !missing(rep78, foreign)
contract rep78 foreign
xi: glm _fre i.rep78*i.foreign, family(poisson)
*---------- end example -----------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten 

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