Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: xtnbreg and mfx


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xtnbreg and mfx
Date   Tue, 17 Aug 2010 07:33:40 +0000 (GMT)

--- On Tue, 17/8/10, Donghyun Lee wrote:
> I'm using xtnbreg for my work and I'm trying to get the
> marginal effect. However, when I type mfx after running
> the regression using xtnbreg, the coefficients are the
> same as before

If you don't specify the -predict()- option in -mfx-, then
-mfx- will use the default predict option of the preceding
estimation command. The default predict option for -xtnbreg-
is the linear predictor, so that is why you got the same
coeficients. The solution is to specify the -predict()- 
option or interpret the incidence ratios, which follow more
naturaly from count models.

Hope this helps,
Maarten

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

http://www.maartenbuis.nl
--------------------------


      

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index