Re: st: differences in relative risks

["Paul O'Brien" <paul.obrien@afe2.org.uk>]

Ricardo,

This might help you - free on BMJ website. Gives the  calculations for 
comparing two estimated relative risks.

 Douglas G Altman and J Martin Bland
Statistics Notes: Interaction revisited: the difference between two 
estimates
 BMJ,  Jan 2003;  326:  219.

Paul

On 12 Mar 2004, at 00:48, Ricardo Ovaldia wrote:


> Thank you Philip. Unfortunately all I have is the RR
> and the corresponding SE. I was thinking that some
> method out of the Meta-analysis literature could be
> used.
>
> --Ricardo.
>
> --- Philip Ryan <philip.ryan@adelaide.edu.au> wrote:
> > One way might be to write out two separate models
> > (eg logistic or
> > log-binomial, depending on your research design) and
> > then use -suest- to
> > test for equality of the coefficients of the
> > suitably parameterised
> > exposures.  For example, as a very general case
> > where both the exposures
> > and the outcomes are different (and the sense is
> > rather open to question!)
> >
> > is the RR for lung cancer among smokers (vs
> > non-smokers) different from the
> > RR of heart disease among males (vs females):
> >
> > glm lung smoker, link(log) fam(binomial) score(s1)
> > est store A
> > glm heart sex, link(log) fam(binomial) score(s2)
> > est store B
> > suest A B
> > test [A_lung]smoker = [B_heart]sex
> >
> >
> >
> > Phil
> >
> >
> >
> > At 09:56 AM 11/03/2004 -0800, you wrote:
> > > Dear all,
> > >
> > > Is there a way in Stata to compare if two relative
> > > risks are equal, or alternatively if the ratio of
> > two
> > > relative risks (RRR) is equal to one?
> > >
> > > Thank you in advance,
> > > Ricardo.
> > >
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> > Associate Professor,
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> =====
> Ricardo Ovaldia, MS
> Statistician
> Oklahoma City, OK
>
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