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]

st: gmm: moment condition for random-effect poisson w/ endogenous regressor?


From   Conan Li <conanli12@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: gmm: moment condition for random-effect poisson w/ endogenous regressor?
Date   Mon, 18 Jun 2012 00:49:26 +0800

Hi Statalist,

I am trying to develop a random-effect poisson model like
E(y(it)|x(it),ηi)=exp(X'(it)β+ηi), where ηi is the individual effect,
and X1 in X' is endogenous and instrumented by lag Z1-Z4(it-1).

The stata11 manual (p595) provides the code for producing the sample
moment condition for FE panel with strictly exogenous variables, but
not for the RE panel. How can modify the code to do that?

Once I have the program for RE poisson, in order to include lag
instruments, do I simply put L.Z1, L.Z2, L.Z3, L.Z4 and variables
excluding X1 in the "instruments()" ? But as discussed by Windmeijer
(2000) on the manual (p599), the second lag (L2) of the endogenous
regressor X1 was used as an instrument. Do I have to do this as well?
The moment condition seems quite different from that of the panel
poisson though.

Thanks.

Conan



--
Qinghua Li (Conan)
State University of New York-College of Environmental Science and Forestry
MS Candidate in Environmental Studies
qli16@syr.edu


-- 
Qinghua Li (Conan)
State University of New York-College of Environmental Science and Forestry
MS Candidate in Environmental Studies
qli16@syr.edu

*
*   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