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RE: st: tab for 3x3


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: tab for 3x3
Date   Tue, 3 Jul 2007 20:23:19 +0100

I would tweak Maarten's example, slightly. 

He had 

contract rep78 foreign

I think there is good reason to go 

contract rep78 foreign, zero 

so that the cells with zeros are explicit. 

Nick 
n.j.cox@durham.ac.uk 

Maarten Buis replied to Lord Yupa
 
> > > 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 )

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