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From |
Ricardo Ovaldia <ovaldia@yahoo.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: differences in relative risks |

Date |
Tue, 16 Mar 2004 13:49:19 -0800 (PST) |

Many thanks to Philip, Tom and Paul for all of their valuable help. Best, Ricardo --- Steichen <steichen@triad.rr.com> wrote: > Ricardo - > > A common assumption in meta-analysis of RR's is that > log(RR) is > approximately normally distributed (how good that > assumption is never stated > though). I would presume that the SE you have is, > in fact, for log(RR), > thus you have everything you need for a Z-test. > > Tom > > ----- Original Message ----- > From: "Ricardo Ovaldia" <ovaldia@yahoo.com> > To: <statalist@hsphsun2.harvard.edu> > Sent: Thursday, March 11, 2004 7:48 PM > Subject: Re: st: differences in relative risks > > > > 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. > > > > > > > >__________________________________ > > > >Do you Yahoo!? > > > >Yahoo! Search - Find what you're looking for > faster > > > >http://search.yahoo.com > > > >* > > > >* For searches and help try: > > > >* > > > > http://www.stata.com/support/faqs/res/findit.html > > > >* http://www.stata.com/support/statalist/faq > > > >* http://www.ats.ucla.edu/stat/stata/ > > > > > > 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 > > > * http://www.stata.com/support/statalist/faq > > > * http://www.ats.ucla.edu/stat/stata/ > > > > > > ===== > > Ricardo Ovaldia, MS > > Statistician > > Oklahoma City, OK > > > > __________________________________ > > Do you Yahoo!? > > Yahoo! Search - Find what you're looking for > faster > > http://search.yahoo.com > > * > > * For searches and help try: > > * > http://www.stata.com/support/faqs/res/findit.html > > * http://www.stata.com/support/statalist/faq > > * http://www.ats.ucla.edu/stat/stata/ > > > > > * > * For searches and help try: > * > http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ __________________________________ Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam http://mail.yahoo.com * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: differences in relative risks***From:*"Steichen" <steichen@triad.rr.com>

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