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Re: st: interactions in gllamm


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: interactions in gllamm
Date   Thu, 31 May 2007 09:33:29 +0100 (BST)

--- Sarah Gill <Sarah.Gill@anu.edu.au> wrote:
> I am trying to run 2 categorical interaction terms with a common
> variable (agegroup) in a gllamm model (see below), and get the error
> message "variables have been dropped, can't continue". I assume this
> is due to collinearity because of the common variable - is there
> anyway to get around this and still be able to estimate these
> interactions?
> 
> xi: gllamm dv time i.sex i.agegroup*smoke i.agegroup*drink, i(id)
> link(logit) family(binom) nrf(2) eqs(inter slope) robust

Make the dummies and interactions yourself or:
xi: gllamm dv time i.sex i.agegroup*smoke i.agegroup|drink, i(id)
link(logit) family(binom) nrf(2) eqs(inter slope) robust

Hope this helps,
Maarten


-----------------------------------------
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/
-----------------------------------------


	
	
		
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