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RE: st: prob by using binreg or logit


From   "Seed, Paul" <paul.seed@kcl.ac.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: prob by using binreg or logit
Date   Fri, 14 Jun 2013 11:08:42 +0000

Dear Statalist, 

Unlike Tim Mak(?) I wouldn't assume people know the difference between Odds and Risk.  
For the record, The risk of an event is essentially the proportion of times it occurs;
the odds is the ratio of the number of times it does occur to the number of times it 
does not occur.  (Please note the absence of any reference to horse-racing.)

Risk = (the number of events)/(the total number of trials) = x/n.  
Odds = (the number of events)/(the number of trials without events) = x/(n-x).  



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