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Re: st: differences in relative risks


From   Philip Ryan <philip.ryan@adelaide.edu.au>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: differences in relative risks
Date   Fri, 12 Mar 2004 13:26:15 +1030

If your two relative risks are supposed to be estimating the same underlying relative risk (ie this is a much more restrictive context than I outlined in my previous response) then you could use the heterogeneity test reported by the -meta- program (Sharpe and Sterne STB 43)

Phil



At 04:48 PM 11/03/2004 -0800, you 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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> Philip Ryan
> Associate Professor,
> Department of Public Health
> Associate Dean (Information Technology)
> Faculty of Health Sciences
> University of Adelaide 5005
> South Australia
> tel 61 8 8303 3570
> fax 61 8 8223 4075
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=====
Ricardo Ovaldia, MS
Statistician
Oklahoma City, OK

__________________________________
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Philip Ryan
Associate Professor,
Department of Public Health
Associate Dean (Information Technology)
Faculty of Health Sciences
University of Adelaide 5005
South Australia
tel 61 8 8303 3570
fax 61 8 8223 4075
http://www.public-health.adelaide.edu.au/
CRICOS Provider Number 00123M
-----------------------------------------------------------
This email message is intended only for the addressee(s)
and contains information that may be confidential and/or
copyright. If you are not the intended recipient please
notify the sender by reply email and immediately delete
this email. Use, disclosure or reproduction of this email
by anyone other than the intended recipient(s) is strictly
prohibited. No representation is made that this email or
any attachments are free of viruses. Virus scanning is
recommended and is the responsibility of the recipient.

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
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*   http://www.ats.ucla.edu/stat/stata/



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