# Re: st: linear probability model (LPM)

 From "Tom Trikalinos" <[email protected]> To [email protected] Subject Re: st: linear probability model (LPM) Date Sun, 13 Jan 2008 18:05:02 -0500

```Maarten,
I kind of disagree back - from a specific angle... The odds ratio is
something I personally -and others- have difficulty grasping, in terms
of its natural meaning. Risk ratios/ratios of probabilities on the
contrary are considerably easier to get... Under known circumstances
odds ratios and risk ratios are numerically very similar ... all too
often they are not... and then this misinterpretation bites...  I
think that this is what Steven meant...

tom

On Jan 13, 2008 1:04 PM, Maarten buis <[email protected]> wrote:
> --- 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
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>
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>
> http://home.fsw.vu.nl/m.buis/
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```