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Re: st: linear probability model (LPM)

From   Maarten buis <[email protected]>
To   [email protected]
Subject   Re: st: linear probability model (LPM)
Date   Sun, 13 Jan 2008 18:04:55 +0000 (GMT)

--- Steven Samuels <[email protected]> wrote:
> A linear probability model is desirable because effects are risk  
> differences, which are much easier to interpret than odds ratios.  

I disagree, both measures are perfectly understandable. With odds
ratios you are representing chance by at odds instead of probability.
Both are easy to understand: odds give you the expected number of
successes for every failure, while probability gives you the expected
proportion of successes. With odds ratios groups are compared by
calculating the ratio: e.g. the odds of success for men is 10% higher
than the odds of succes for women. With risk difference you are
comparing the groups by computing differences. 

-- 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

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