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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   Mon, 17 Feb 2014 23:49:27 -0300

Em 17/02/2014 22:40, Steve Samuels escreveu:

I recently co-authored a paper for which I first ran
-svy: poisson-
> and then
-svy: glm, link(log)
> which failed in about 2 of 20 models.
> I found four or five instances in which the relative risks differed so much that we had to abandon the idea of the Poisson approach. In others, the CIs for the RR exceeded 1.0  We were able to get -svy: glm, link(log) to work by slight modification of the models.
> You still have not shown us the actual commands you ran and the problematic -svy: glm- output.
Please do so.  Right now we have no actual evidence of the problem.. The only difference that I can see in the output of -glm- and -svy: glm, with the "eform" option is that -glm- heads the  coefficient table "Risk Ratio" whereas -svy: glm- has a heading "exp(b)", which is the same thing.

> Steve Samuels

Dear Steve:
could you give the reference of your paper and the complete Stata code command? I am very interested in this subject.
Thank you.
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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