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: RE: xtabond2--number of instruments.


From   DE SOUZA Eric <eric.de_souza@coleurope.eu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: xtabond2--number of instruments.
Date   Tue, 28 Jun 2011 15:19:37 +0200

To your question concerning whether it is counting instruments for each year, the answer is yes. I forgot to answer this in my previous reply.
See in -xtabond2- the difference between instruments introduced with the option -iv- and instruments introduced with the option -gmm-

Eric


Eric de Souza
College of Europe
Brugge (Bruges), Belgium
http://www.coleurope.eu



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Steven Archambault
Sent: 28 June 2011 00:15
To: statalist@hsphsun2.harvard.edu
Subject: st: xtabond2--number of instruments.

Hi all,

I am trying to figure out xtabond2. I don't see why this command gives me 42 instruments

xtabond2 lnyp l(1/2).lnyp yr1988-yr2009, gmm(l(1).lnyp, laglimits(1 2)) robust noleveleq

This equation gives me 56 instruments

 xtabond2 lnyp l(1/2).lnyp yr1988-yr2009, gmm(l(1).lnyp, laglimits(1 3)) robust noleveleq

Is it counting instruments for each year? I don't quite get it.

By the way, there are 1752 observations, 122 panels.

I'd appreciate the info. Also, I am reading "How to do xtabond2". Its very informative, but I am still unclear.

Thanks!

-Steve


*
*   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/

*
*   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