. dfgls dlnRDR
DF-GLS for dlnRDR Number of obs = 2
Maxlag = 6 chosen by Schwert criterion
DF-GLS tau 1% Critical 5% Critical 10% Critical
[lags] Test Statistic Value Value Value
------------------------------------------------------------------------------
6 . -3.770 -547.583 -430.609
5 . -3.770 -297.349 -227.087
4 . -3.770 -134.100 -94.835
3 . -3.770 -39.386 -18.618
2 . -3.770 5.243 16.799
1 . -3.770 18.237 26.650
Opt Lag (Ng-Perron seq t) = 0 [use maxlag(0)]
Min SC = . at lag . with RMSE .
Min MAIC = . at lag . with RMSE .
. dfgls dlnGDP
DF-GLS for dlnGDP Number of obs = 2
Maxlag = 6 chosen by Schwert criterion
DF-GLS tau 1% Critical 5% Critical 10% Critical
[lags] Test Statistic Value Value Value
------------------------------------------------------------------------------
6 . -3.770 -547.583 -430.609
5 . -3.770 -297.349 -227.087
4 . -3.770 -134.100 -94.835
3 . -3.770 -39.386 -18.618
2 . -3.770 5.243 16.799
1 . -3.770 18.237 26.650
Opt Lag (Ng-Perron seq t) = 0 [use maxlag(0)]
Min SC = . at lag . with RMSE .
Min MAIC = . at lag . with RMSE .
我担心是样本少,所以将最大滞后期设定为2期,输出的结果如下:
dfgls dlnRDR,maxlag(2)
DF-GLS for dlnRDR Number of obs = 6
DF-GLS tau 1% Critical 5% Critical 10% Critical
[lags] Test Statistic Value Value Value
------------------------------------------------------------------------------
2 -1.049 -3.770 -2.095 -0.884
1 -0.966 -3.770 -2.386 -1.232
Opt Lag (Ng-Perron seq t) = 0 [use maxlag(0)]
Min SC = -1.41785 at lag 1 with RMSE .3651118
Min MAIC = -.7595058 at lag 1 with RMSE .3651118
(1)通过这个结果滞后期应该选择几期会平稳呢?
(2)根据Mis SC应该选择滞后一期平稳,但是ADF检测值在滞后2期的时候为-1.049,小于10%置信水平,是不是说明在滞后2期的时候数据平稳呢?
谢谢非常谢谢