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Re: st: repeated measurements. How to use Stata instead of MlwiN?


From   "jose maria" <jmpsouza@usp.br>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: repeated measurements. How to use Stata instead of MlwiN?
Date   Sun, 30 Mar 2003 22:07:07 -0300

Thank you very much. Your orientation on using xtreg, re and fe helped
wonderfuly.
Cheers,
Jose Maria

Jose Maria Pacheco de Souza, Professor Titular
Departamento de Epidemiologia
Faculdade de Saude Publica/Universidade de Sao Paulo
Av. Dr. Arnaldo, 715 cep 01246-904
Sao Paulo Brasil
fones (11)3082-3886  (11)3714-2403  (11)3768-8612
fax   (11)3082-2920  (11)3714-2403
www.fsp.usp.br/~jmpsouza
jmpsouza@usp.br

From: "Chris Rohlfs" <car@uchicago.edu>

> dear jose,
>
> i believe the answer is yes to both of those questions,... , but i think
in a case like you described i'd just
> use -xtreg-
>
> with the re (random effects) option if you just want to correct for the
> autocorrelation & degrees of freedom issue associated w/ using repeated
> measurements
>
> with the fe (fixed effects) option if you want to control for omitted
> child-specific characteristics that might be correlated with the
> treatment.  -- if you're running a randomized experiment, then this
> shouldn't be necessary.
>
> with the be (between estimator) option if you have noisy data and you want
> to reduce the measurement error by comparing child-specific averages for
> all your variables.
>
> chris
>
> On Sun, 30 Mar 2003, jose maria wrote:
>
> > Dear Statalisters:
> > I have a very simple problem : to compare two treatmentes
> > (A vs B), measuring the z scores of the same children every 4 months, in
one
> > year period, that is, a regression with repeated measurements. I do not
want
> > to use the MlwiN package . Can I use the xt/gee Stata
> > suite? Can I use the gllamm program . I have both 7 and 8
> > Jose Maria
> >



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