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st: comparing curves using fracpoly regress


From   "josemaria" <jmpsouza@usp.br>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: comparing curves using fracpoly regress
Date   Sat, 7 Jun 2003 10:32:35 -0300

Dear statalisters:
May I get help for the problem below?
 I want to compare 4 groups (A, B, C, D). For each group, I have a set of
individuals  with two measurements for each: a time variable ( t= age in
months) and a quantitative variable ( hb= level of haemoglobin). The
interest is to construct 4 curves, hb as a function of t, using _fracpoly
regress_, and to compare statistically the curves using the regression
coefficients, maybe with _test_ after running _fracpoly_. _Fracplot_ for the
4 curves, in a one graph, is also important.
Thanks for any help.
Jose Maria

Jose Maria Pacheco de Souza, Professor Titular
Departamento de Epidemiologia/Faculdade de Saude Publica, USP
Av. Dr. Arnaldo, 715
01246-904  -  S. Paulo/SP - Brasil
fones (11)3082-3886; (11)3066-7724; (11)3768-8612; (11)3714-2403
fax (11)3082-2920; (11)3714-2403
www.fsp.usp.br/~jmpsouza

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