Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: RE: interactions in gllamm


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: interactions in gllamm
Date   Thu, 31 May 2007 10:11:52 +0200

--- Sarah Gill 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/
-----------------------------------------


 

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index