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


From   Chris Rohlfs <car@uchicago.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: repeated measurements. How to use Stata instead of MlwiN?
Date   Sun, 30 Mar 2003 15:41:24 -0600 (CST)

dear jose,

i believe the answer is yes to both of those questions, though i'm not
familiar w/ gllamm or hierarchical models.  i'm not quite sure i
understand the question, 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 (for the beginning): 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 (I do not have it). Can I use the xt/gee Stata
> suite? Can I use the gllamm program (what version?). I have both 7 and 8
> versions of Stata.
> Thanks.
> 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
> 
> 
> 
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