拒绝被检验的指数序列是平稳的原假设
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AutocorrelationPartialCorrelation
ACPACQ-StatProb
NullHypothesis:
DDM2hasaunitroot
Exogenous:
None
LagLength:
7(Automatic-basedonSIC,maxlag=13)
t-Statisti
Prob.
AugmentedDickey-Fullertest
statistic
-9.2231320.0000
Testcritical
values:
1%level
-2.579587
5%level
-1.942843
10%level
-1.615376
*MacKinnon(1996)one-sidedp-values.
AugmentedDickey-FullerTestEquation
DependentVariable:
D(DDM2)
Method:
LeastSquares
Date:
04/16/13Time:
10:
41
Sample(adjusted):
1991M112005M01
Includedobservations:
159afteradjustments
Coefficie
t-Statist
ic
Prob.
Variable
ntStd.Error
DDM2(-1)
-8.900755
0.965047
-9.223132
0.0000
D(DDM2(-1))
6.431129
0.924672
6.955038
0.0000
D(DDM2(-2))
4.970286
0.833541
5.962861
0.0000
D(DDM2(-3))
3.802432
0.700773
5.426055
0.0000
D(DDM2(-4))
2.617058
0.544596
4.805501
0.0000
D(DDM2(-5))
1.688201
0.380559
4.436109
0.0000
D(DDM2(-6))
0.910968
0.214990
4.237257
0.0000
D(DDM2(-7))
0.325934
0.080151
4.066487
0.0001
R-squared
Adjusted
0.941321Meandependentvar0.112057
0.938601S.D.dependentvar4339.324
R-squared
Akaikeinfo
S.E.of
regression1075.236criterion16.84747
Sumsquaredresid1.75E+08Schwarzcriterion17.00188
Hannan-Quinn
16.91018
Loglikelihood-1331.374criter.
Durbin-Watson
stat1.963915
DDM2
DependentVariable:
DDM2
Method:
LeastSquares
Date:
04/16/13Time:
10:
47
Sample(adjusted):
1991M052005M01
Includedobservations:
165afteradjustments
Convergeneeachievedafter50iterations
MABackcast:
1990M121991M04
Coefficiet-Statist
VariablentStd.ErroricProb.
C
14.44319
10.740651.344723
0.1807
AR
(1)
-0.995579
0.055305-18.00153
0.0000
AR
(2)
-0.837713
0.047357-17.68914
0.0000
MA
(1)
-0.436708
0.096208-4.539223
0.0000
MA
(2)
0.175063
0.1043591.677513
0.0954
MA(3)
-0.880075
0.052403-16.79446
0.0000
MA(4)
0.322618
0.1000053.226012
0.0015
MA(5)
0.190454
0.0965081.973453
0.0502
Mean
R-squared
0.805361dependentvar
16.34363
Adjusted
S.D.
R-squared
0.796682dependentvar
2309.544
S.E.of
Akaikeinfo
regression
1041.391criterion
16.78177
Schwarz
Sumsquaredresid1.70E+08
criterion
16.93236
Hannan-Quinn
Loglikelihood
-1376.496criter.
16.84290
Durbin-Watso
F-statistic
92.80278nstat
2.041303
Prob(F-statistic
)
0.000000
InvertedARRoots
-.50+.77i
-.50-.77i
InvertedMARoots
.77+.22
-.40-.91
.77-.22i
-.30i
-.40+.91i
【P127例4-3】
本案例的数据为联通股票的日股价序列,期限为2003年1月2日至2006年9月
15日,共886个样本观测量。
对其进行单位根检验,结果如下:
NullHypothesis:
Xhasaunitroot
Exogenous:
None
LagLength:
0(Automatic-basedonSIC,maxlag=20)
t-StatistiProb
c.
AugmentedDickey-Fullertest
statistic
0.0760050.7067
Testcritical
values:
1%level
-2.567575
5%level
-1.941181
10%level
-1.616459
ic
nt
X(-1)4.71E-050.0006190.0760050.9394
Mean
R-squared-0.000167dependentvar0.000587
AdjustedS.D.
R-squared-0.000167dependentvar0.044573
S.E.ofAkaikeinfo-3.38207
regression0.044577criterion1
Schwarz-3.37666
Sumsquaredresid1.758589criterion
Hannan-Quinn-3.38000
Durbin-Watson
stat2.014381
从上图我们可以看出t-statistic的值是0.076005,大于临界值,p>a,故
不能拒绝被检验的指数序列是非平稳的原假设。
因此一阶差分序列进行AD脸验,结果如下图显示。
NullHypothesis:
D(X)hasaunitroot
Exogenous:
None
LagLength:
0(Automatic-basedonSIC,maxlag=20)
t-Statisti
c
Prob
*
AugmentedDickey-Fullerteststatistic
-29.94678
0.0000
Testcriticalvalues:
1%level
-2.567578
5%level
-1.941181
*MacKinnon(1996)one-sidedp-values.
AugmentedDickey-FullerTestEquation
DependentVariable:
D(X,2)
Method:
LeastSquares
Date:
04/16/13Time:
10:
54
Sample(adjusted):
1/06/20039/14/2006
Includedobservations:
885afteradjustments
D(X(-1))
-1.0071650.033632-29.94678
0.0000
Mean
-1.13E-0
R-