ADF

Yangtze River Delta

Shanghai

Jiangsu

Zhejiang

Anhui

Statistic

P value

Statistic

P value

Statistic

P value

Statistic

P value

Statistic

P value

−2.3663

0.0002

−3.4771

0.00031

−2.6342

0.0001

−5.7173

0.0000

−4.3701

0.0001