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R: st: MIXLOGIT: marginal effects


From   "Davide Castellani" <davide.castellani@unibg.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   R: st: MIXLOGIT: marginal effects
Date   Mon, 6 Feb 2012 15:39:32 +0100

Dear Arne and dear Marteen, 

Thanks a lot for the help provided. 

I am using stata 12. Sorry for not specifying it in my previous e-mail.

In my case, for the purpose of my analysis, I find MEs more appropriate than
odds. 

Best,
Davide

Arne: I guess that mixlogit is a great program. 


-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Arne Risa Hole
Inviato: lunedì 6 febbraio 2012 15:04
A: statalist@hsphsun2.harvard.edu
Oggetto: Re: st: MIXLOGIT: marginal effects

Thanks Maarten. Just a small clarification: -mixlogit- allows for
multinomial outcomes while -xtmelogit- is for binary outcomes only so
the two are not substitutes in general. Another difference is that
-mixlogit- uses simulation to approximate the likelihood function,
while -xtmelogit- uses quadrature. For more information about
-mixlogit- see <http://www.stata-journal.com/article.html?article=st0133>.

I disagree when it comes to marginal effects: I personally find them
much easier to interpret than odds-ratios. In the end the choice will
depend on your discipline and personal preference.

Arne

On 6 February 2012 13:29, Maarten Buis <maartenlbuis@gmail.com> wrote:
> On Mon, Feb 6, 2012 at 1:57 PM, Davide Castellani wrote:
>> I am new to the mixlogit program. I was wondering how to work out
marginal
>> effects ( and SEs of MEs).
>
> -mixlogit- is a user writen program, so per the Statalist FAQ (url at
> the bottom of every post on Statalist) you must say where you got it
> from. I will assume that you got it from the SSC archive, i.e. you
> used -ssc install mixlogit- to install -mixlogit-.
>
> It seems that -mixlogit- does not contain a standard predict function,
> so that means you cannot use any of the standard methods like
> -margins- or -mfx-.
>
> Since you did not say which version of Stata you are using, we will
> have to asume (again per the Statalist FAQ) that it is Stata 12. In
> that case you can just use the official -xtmelogit- command. This will
> allow you to use -margins- to get marginal effects at the average
> values (or other typical values) of the explanatory variables.
> However, many people seem to want average marginal effects, which is
> not the same. This is much harder to obtain.
>
> In general, I would just interpret the odds ratios. I do not
> understand why people go through a lot of trouble fitting a non-linear
> model and than undoing all that effort by only reporting marginal
> effects, which in effect reduces your non-linear model to a linear
> model. If you wanted a linear model, than why not fit a linear model?
> If you think a linear model is unacceptable in your case or in
> general, than so are marginal effects.
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
>
> http://www.maartenbuis.nl
> --------------------------
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