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Re: st: Binomial regression


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Binomial regression
Date   Sat, 4 Aug 2007 07:47:11 +0100 (BST)

--- Marcello Pagano <pagano@hsph.harvard.edu> wrote:
> I agree wholeheartedly that the risk difference is sometimes
> preferable to the odds ratio. Witness what is currently going on with
> the attack on Avandia.  Rather than report a risk difference of 0.2% 
> in the MI rate, we are faced with a risk INCREASE of 40% -- the 
> effect of going from 0.5% to 0.7%.  If reported as a risk difference
> it would probably not have made the headlines it has nor created the 
> furor it has.

At this point I think that there is room for improvement in Stata
output. When reporting odds ratios after -logit-, Stata will not report
the baseline odds (-exp(_cons)-), So Stata reports that the odds
increased with 40%, but not that the baseline odds is .005 (at these
low probabilities risks and odds are almost the same). I would like to
see the baseline odds and the odds ratios, because both give very
useful information about the size of the effect, as Marcello's
example illustrates.

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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