消除了异方差,做了一阶季节差分和一阶非季节差分,现在根据
D12DLnx的相关和偏相关图分析,应该建立 (1, 1, 1) ´(1, 1, 1)12 模型,但是通不过T检验,
请高手们指教


ADF Test Statistic -6.413521 1% Critical Value* -3.4713
5% Critical Value -2.8791
10% Critical Value -2.5760
Dependent Variable: DLOG(X,1,12)
Method: Least Squares
Date: 04/23/12 Time: 20:48
Sample(adjusted): 1998:03 2011:02
Included observations: 156 after adjusting endpoints
Convergence achieved after 14 iterations
Backcast: 1997:02 1998:02
Variable Coefficient Std. Error t-Statistic Prob.
C 0.000299 0.000802 0.372588 0.7100
AR(1) -0.014368 0.171154 -0.083946 0.9332
SAR(12) -0.161661 0.076352 -2.117295 0.0359
MA(1) -0.264439 0.172945 -1.529038 0.1283
SMA(12) -0.885842 0.000180 -4932.826 0.0000
R-squared 0.565279 Mean dependent var 0.000667
Adjusted R-squared 0.553764 S.D. dependent var 0.115486
S.E. of regression 0.077146 Akaike info criterion -2.254714
Sum squared resid 0.898672 Schwarz criterion -2.156962
Log likelihood 180.8677 F-statistic 49.08739
Durbin-Watson stat 1.995576 Prob(F-statistic) 0.000000
Inverted AR Roots .83 -.22i .83+.22i .61 -.61i .61 -.61i
.22+.83i .22 -.83i -.01 -.22+.83i
-.22 -.83i -.61 -.61i -.61+.61i -.83 -.22i
-.83+.22i
Inverted MA Roots .99 .86 -.49i .86+.49i .49 -.86i
.49+.86i .26 .00+.99i -.00 -.99i
-.49+.86i -.49 -.86i -.86+.49i -.86 -.49i
-.99