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From |
Ronan Conroy <rconroy@rcsi.ie> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: calculating relative risk |

Date |
Wed, 5 Dec 2007 09:25:18 +0000 |

On 4 Dec 2007, at 22:46, Sue Kim wrote:

I think it's time to listen to Stata. The trouble with the relative risk is that it can produce nonsense estimates of probability in some cases. If a risk factor has a relative risk of 2, and a case has a predicted probability, based on other risk factors, of 0.6, then the addition of the final risk factor will bring the predicted risk to 1.2.Hi. I have a binary outcome where the probability of outcome is low so I want to get an adjusted relative risk (rather than odds ratio) using glm. When using glm with fam(bin) link(log) command, I get a warning "parameter estimates produce inadmissible mean estimates in one or more observation". Could I still use the results or is there a way to get around this problem?

The odds ratio, for all its awkwardness, hasn't got this drawback.

Incidentally, Stata has a command -binreg- which is a canned version of what you have been doing. It has an option to give you the relative risk directly.

P Before printing, think about the environment

=================================

Ronan Conroy

rconroy@rcsi.ie

Royal College of Surgeons in Ireland

Epidemiology Department,

120 St Stephen's Green, Dublin 2, Ireland

+353 (0)1 402 2431

+353 (0)87 799 97 95

http://www.flickr.com/photos/ronanconroy/sets/72157601895416740/

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**References**:**st: calculating relative risk***From:*Sue Kim <sekim930@yahoo.com>

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