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Re: st: marginal effects for ordered logit


From   "maartenbuis" <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: marginal effects for ordered logit
Date   Thu, 11 Nov 2004 15:06:42 -0000

Aaaaah, I need coffee, and lots of it:

if:
L(xb)= exp(xb)/(1+exp(xb))
 
then:
dL/d(xb)=exp(xb)/(1+exp(xb))^2
 
not:
dL/d(xb)=exp(xb)/(1+xb)^2


--- In statalist@yahoogroups.com, "maartenbuis" <maartenbuis@y...> 
wrote:
> Oops, the explanation in 
http://www.stata.com/statalist/archive/2004-
> 11/msg00264.html contains a typo. The commands are correct though. 
> 
> if:
> L(xb)= exp(xb)/(1-exp(xb))
> 
> then:
> dL/d(xb)=exp(xb)/(1-exp(xb))^2
> 
> not:
> dL/d(xb)=exp(xb)/(1-xb)^2
> 
> 
> 
> 
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