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# st: RE: prob by using binreg or logit

 From tshmak To "statalist@hsphsun2.harvard.edu" Subject st: RE: prob by using binreg or logit Date Thu, 13 Jun 2013 16:06:53 +0800

```Dear Carsten,

There certainly are differences. rr stands for risk ratio. or stands for odds ratio. I assume you know the difference between "odds" and "risk". -binreg- with the rr option assumes that the log of the risk (or probability) is a linear function of the covariates. -logit-, or binreg with the -or- option, assumes that the log of the odds is a linear function of the covariates. That should be enough to lead to differences.

HTH,
Tim

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of carsten hinrichsen
Sent: 12 June 2013 23:14
To: statalist@hsphsun2.harvard.edu
Subject: st: prob by using binreg or logit

Dear statalisters,

I am working with survey data and want to find the probability of participation by analyzing the binary variable of participation (yes/no).

As far as I know, I could use binreg with the rr option
or
I could use logit and use the odds to calculate the probability.

I've tried both and get slightly different results. I've been looking through the stata help but can't figure out what the difference is between these to methods.
So I'm wondering are there different assumptions behind these to methods that I should take into consideration?
And should I prefer one of the methods to the other?

Any help is appreciated.

Kind regards
Carsten Hinrichsen
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