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Re: st: mfx after xtlogit

From   Maarten buis <[email protected]>
To   [email protected]
Subject   Re: st: mfx after xtlogit
Date   Wed, 9 Sep 2009 20:02:38 +0000 (GMT)

--- On Wed, 9/9/09, Filipa de Castro wrote:
> What exactly means the option "predict(pu0)" in mfx after
> xtlogit?
> What does it imply that the random effect is fixed to 0?

In non-linear models like -logit- or -xtlogit- the marginal
effect is not constant (this is the very definition of 
non-linear), but differs for different values of the 
explanatory variables. To compute one number we need to fix
the values of the explanatory variables to some meaningful 
number, e.g. the mean. In a random effects model like
-xtlogit- one of the "explanatory variables" is the random
variable, so we need to fix it's value to. Fixing it to 0
means that we fix it to the average value.

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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