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st: first xtmixed question


From   David Airey <david.airey@vanderbilt.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: first xtmixed question
Date   Tue, 12 Apr 2005 18:08:40 -0500

.

Actually, this is not so much about xtmixed but Mata. There is some discussion of Mata and speed recently. I saw one posting from Vince Wiggins of Stata Corp. suggesting a 2000 fold improvement relative to .ado code when multiplying matrices. What is the performance loss of a program like xtmixed coded by .ado (if there ever was such a thing during development), and coded as it is, and how does it now fair compared to SAS Proc Mixed, SPSS Mixed, or R LME in terms of speed? I'm assuming speed is comparable across these packages. This is not an important question to answer, just curious.
--
David C. Airey, Ph.D.
Vanderbilt University Medical Center
Department of Pharmacology
8148-A Medical Research Building Three
465 21st Avenue South
Nashville, TN 37232-8548
(615) 936-1510 (voice)
(615) 936-3747 (fax)
david.airey@vanderbilt.edu
http://homepage.mac.com/david.airey/vita/

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