Relative Risk in logistic regression

If you use a log link, you are not, I believe, performing a logistic
regression!

"Kevin E. Thorpe" <kevin.thorpe at utoronto.ca> 1/30/2013 11:22 AM >>>
On 01/30/2013 11:17 AM, John Sorkin wrote:

 > I am not sure why one would want a relative risk from a logistic
 > regression. The measure of association from a logistic regression is the
 > odds ratio, not the relative risk.
 > John
 >

Yes, the natural measure, when using the logit link, is the OR.  I
always use that myself, but if you use the log link, you get RR.  As for
why you would, I would suggest it's because physicians think they
understand a RR better than and OR.

 > "Kevin E. Thorpe" <kevin.thorpe at utoronto.ca> 1/30/2013 11:14 AM >>>
 > On 01/30/2013 09:02 AM, nalluri pratap wrote:

 >  > Relative risk = exp(coef(model))
 >  >

 >
 > Only if you fit using the log link.  Using the logit link, this gives
 > odds ratios.
 >

 >  > --- On Wed, 30/1/13, aminreza Aamini <amin.r.fan at gmail.com> wrote:
 >  >
 >  >
 >  > From: aminreza Aamini <amin.r.fan at gmail.com>
 >  > Subject: [R] Relative Risk in logistic regression
 >  > To: "R-help" <R-help at r-project.org>
 >  > Date: Wednesday, 30 January, 2013, 4:19 PM
 >  >
 >  >
 >  > Hi all,
 >  > I am very grateful to all those who write to me
 >  > 1) how i  can  obtain relative risk (risk ratio) in logistic

 > regression in R.

 >  > 2) how to obtain  the predicted risk for a certain individual using
 >  > fitted regression model in R.
 >  >
 >  > Many thanks, in advance, for your help.
 >  >
 >  > Amin.
 >  >
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