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st: Hadrilm test


From   "Naceur Khraief" <nkhraief@ecn.ulaval.ca>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Hadrilm test
Date   Tue, 23 Nov 2004 18:40:50 -0500

Hi Users
 
I have a question about the Hadrilm test of statinarity in Panel data.
Can I use this test with unblanced panel?
 
With stata I have this result bellow, but I can't conclude if there's a stationnarity or no.   

hadrilm D.lnPTMQ (stata command)
 
Hadri (2000) panel unit root test for D.lnPTMQ
with 190 observations on 6 cross-sectional units
 
eps       Z(mu)       P-value      Z(tau)     P-value
Homo   -2.510      0.9940      -3.445     0.9997
Hetero  -2.227      0.9870      -3.190     0.9993
SerDep   -1.993    0.9769      -2.379     0.9913
 
H0: all 6 timeseries in the panel are stationary processes
Homo: homoskedastic disturbances across units
Hetero: heteroskedastic disturbances across units
SerDep: controlling for serial dependence in errors (lag trunc = 5)
 
 hadrilm lnPTMQ (stata command)
 
Hadri (2000) panel unit root test for lnPTMQ
with 191 observations on 6 cross-sectional units
eps       Z(mu)        P-value      Z(tau)       P-value
Homo     67.356     0.0000      54.293     0.0000
Hetero   85.159      0.0000      82.480     0.0000
SerDep   15.167     0.0000      12.885     0.0000
 
H0: all 6 timeseries in the panel are stationary processes
Homo: homoskedastic disturbances across units
Hetero: heteroskedastic disturbances across units
SerDep: controlling for serial dependence in errors (lag trunc = 5)
 
N.B: lnPTMQ is the dependent variable in my model and D.lnPTMQ is the first difference.
 
Thanks in advance.
Naceur Khraief 


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