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st: Re: panel unit root tests


From   Ricardo Gonçalves Silva <ricardogs@terra.com.br>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: panel unit root tests
Date   Sat, 12 Mar 2005 16:18:24 -0300

Hi,

No, you cannot perform the joint test, since, under H0, the test statistics does not have a standard distribution.
In fact, to test H0: B1 + B2 = 0 vs. H1: B1 + B2 < 0, you must type levinlin, lags(2), for the Levin et al. (2002) test.

Rick
----- Original Message ----- From: "James Shaw" <james_shaw2004@yahoo.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Saturday, March 12, 2005 2:10 PM
Subject: st: panel unit root tests



Everyone,

I have a dynamic panel data model that is specified as
follows:

y_it = B0 + B1y_i(t-1) + B2yi(t-2) + ... + A_i + u_it

Using appropriate estimators for this model
(Arellano-Bond, Anderson-Hsiao), I am getting very
large estimates for the autoregressive parameters, B1
and B2.  In fact, the sum of the estimates for B1 and
B2 approaches 1.0.  I believe that one could formally
test H0:  B1 + B2 = 0 vs. H1: B1 + B2 < 0 using a
panel data unit root test, such as that described by
Levin et al. (2002), which is implemented in Stata as
LEVINLIN.  Assuming this is correct, what would the
appropriate command line be?  For example, "levinlin
y, lag(0)" or "levilin y, lag(2)."  Alternatively,
maybe the problem is easier than I imagine and I could
simply perform a joint test of the estimates for B1
and B2 to see if they are equal to 1.0.

--
Jim





then how would I would

James W. Shaw, Ph.D., Pharm.D., M.P.H.
Post-Doctoral Fellow
Tobacco Control Research Branch
Behavioral Research Program
Division of Cancer Control and Population Sciences
National Cancer Institute
Tel.:  215-852-3045
Fax:  215-542-7150



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