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st: Gllamm does more than mixed models


From   Stephen McKay <[email protected]>
To   [email protected]
Subject   st: Gllamm does more than mixed models
Date   Mon, 26 Apr 2004 12:43:24 +0100

stata needs a mixed-models routine to remain competitive (for some 
users) against SAS and even SPSS.

Incorporating gllamm into the main stata code may be one way forward, 
but there are others.  Some multilevel texts (eg Snijders & Bosker 
2002) note the usefulness of the xt commands for models with random 
intercepts.  Extending the xt series, if possible (a big if), might 
provide a simpler set of commands for some existing users to run mixed 
models than learning the more fully featured gllamm.

Benchmarks of gllamm against SAS/HLM/MLwin/R-nlme for standard mixed
models -- whilst in some senses unfair -- would make stata appear 
extremely slow.

----------------------
Stephen McKay
PFRC, School of Geographical Sciences
University of Bristol
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