各位,请问以下的数据怎么进行ADF单位根检验??我检验出来LTTI的一阶差分是平稳的,但是LGDP却怎么都检验不出来,求各位大侠帮我解决下。谢谢啊!!!数据如下,
YEAR | GDP | LGDP | TTI | LTTI |
1995 | 2443.21 | 7.801068027 | 76 | 4.330733 |
1996 | 2787.25 | 7.932810726 | 83.1 | 4.420045 |
1997 | 2924.19 | 7.980772798 | 95.62 | 4.560382 |
1998 | 3185.19 | 8.066267221 | 115.43 | 4.748664 |
1999 | 3410.39 | 8.134581933 | 207.57 | 5.335469 |
2000 | 3682.23 | 8.211273826 | 241.94 | 5.48869 |
2001 | 4004 | 8.29504914 | 292.83 | 5.679592 |
2002 | 4450.42 | 8.400753753 | 358.1 | 5.880812 |
2003 | 4915.74 | 8.500197581 | 387.87 | 5.96067 |
2004 | 5637.21 | 8.637144541 | 500.34 | 6.215288 |
2005 | 6410.68 | 8.765720629 | 626.09 | 6.439494 |
2006 | 7416.78 | 8.91150028 | 836.02 | 6.728653 |
2007 | 8611.11 | 9.060808509 | 992.43 | 6.900156 |
2008 | 9370.34 | 9.145304661 | 811.66 | 6.699082 |
2009 | 10597.03 | 9.268329052 | 1102.65 | 7.005472 |
2010 | 12249.8 | 9.413264889 | 1367.23 | 7.220542 |
2011 | 14461.28 | 9.579230012 | 1684.46 | 7.4292 |
2012 | 15987.26 | 9.679547434 | 2011.74 | 7.606755 |