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st: multilevel analysis: cross-level interactions in gllamm


From   "G. ter Riet" <G.terRiet@amc.uva.nl>
To   statalist@hsphsun2.harvard.edu
Subject   st: multilevel analysis: cross-level interactions in gllamm
Date   Tue, 26 Nov 2002 13:34:16 +0100

Hi,
I used the gllamm command for a multilevel analysis in which I try to 
explain why some general practitioners (GP) order more diagnostic tests 
than others. There are explanatory variables at the level of single 
general practitioners, GP-groups in which they collaborate, and regions 
in which these groups work and order tests with a one diagnostic 
facility per region. So far I kept it simple:

gllamm var1 var2 var3, i(group region) offset(ln_practice_size) allc

,where var1 is a variable at the GP level, var2 a variable at the group 
level, and var3 a variable at the region level. How do I implement 
cross-level interactions in this model, that is by using which syntax?

Thanks,
Gerben

Gerben ter Riet, MD PhD, Academic Medical Center
Dept. General Practice, Room J3-354, 1105 AZ Amsterdam
Tel. ++31 (0)20 566 4640; Fax: ++31 (0)20 566 9186 (Mo thru' Wed)
Wiss. Mitarbeiter, Horten Zentrum, Univ Zurich; www.evimed.ch (Fri)
Hon. Sen. Res. Fellow, Univ. Birmingham (UK)

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