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Re: st: RE: RE: Using command svy glm to obtain risk ratios

From   jose maria pacheco de souza <>
Subject   Re: st: RE: RE: Using command svy glm to obtain risk ratios
Date   Tue, 18 Feb 2014 22:04:05 -0300

Em 18/02/2014 19:28, Steve Samuels escreveu:
Jose Maria asked:

"would it be possible to use *predict pr, pr* instead of *margins*?

If there are only a few discrete covariates, then you can graph or table
all the predicted probabilities. Otherwise -margins- is preferable, I think,
especially when followed -marginsplot-. My own strategy, when the choice is mine, is
to fit -svy: logistic-,This will (almost) always converge with no
difficulties. Then I look at -marginsplot- of predicted probabilities; I
add two-factor interactions and see what happens to the plot

For most studies, I prefer to describe effects in terms of linear
differences in predicted probabilities, even if the underlying model is
-logistic- with no or few interactions.


Thanks again. Very helpful.
josé maria
Jose Maria Pacheco de Souza
Professor Titular (aposentado), Professor Senior
Departamento de Epidemiologia/Faculdade de Saude Publica, USP
Av. Dr. Arnaldo, 715
01246-904  -  S. Paulo/SP - Brasil
fone (11)3768-8612
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