Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: dtobit


From   "Giovanni Vecchi" <vecchi@economia.uniroma2.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: dtobit
Date   Thu, 17 Apr 2003 18:43:16 +0200

Dear statlisters:

The fact that dtobit provides marginal effects for the intercept term is
something which I cannot explain. In my view marginal effects should be
calculated for all covariates except for the constant term. In fact, I
don't know how to interpret the marginal change of something (intercept)
which is fixed by its very nature. May be I am missing something...

I would also like to note that <mfx compute> omits the partial effects
for the intercept from its output, and I think it would be desirable to
have dtobit behave similarly. 


I would appreciate any comments on this.


Giovanni

----------------------------------------------------------
Giovanni VECCHI
Dipartimento di Economia e Istituzioni
UniversitÓ di Roma "Tor Vergata"
Via Columbia, 2
00133 Roma
Italy

voice   + 39 (06) 7259 5730
fax     + 39 (06) 2020 500
email   vecchi@economia.uniroma2.it
webpage http://www.economia.uniroma2.it/dei/membri/vecchi
----------------------------------------------------------


*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   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   |   What's new   |   Site index