Dears Dave, Sam and Rich:
thank you very very much.
Thanks also for the orientation to go for 
http://www.ats.ucla.edu/stat/stata/faq/xtmixed.htm.
For the basics, may I understand that the trick is to use both the 
repetition_ocasions and the subject_identification as categorical variables?
Greetings,
José Maria
Jose Maria Pacheco de Souza, Professor Titular (aposentado)
Departamento de Epidemiologia/Faculdade de Saude Publica, USP
Av. Dr. Arnaldo, 715
01246-904  -  S. Paulo/SP - Brasil
fones (11)3061-7747; (11)3768-8612
fax (11)3714-2403
www.fsp.usp.br/~jmpsouza
----- Original Message ----- 
From: "David Airey" <[email protected]>
To: <[email protected]>
Sent: Tuesday, December 09, 2008 12:50 AM
Subject: Re: st: is there a -regress- command equivalent to the pair matched 
ttest?
A paired ttest is equivalent to a repeated measures ANOVA with two  levels 
to the repeated factor. You can see the regression equivalent  below.
webuse fuel, clear
.....
xi: regress mpg i.repeat i.subject
On Dec 8, 2008, at 7:05 PM, josemaria wrote:
is there a sort of -
regress- command that allows to conduct a pair-matched -ttest-, but
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