Unit root test of time series data

• 还有；时序列数据单位根检定法

Unit root test of time series data的用法和样例：

例句

1. We have plenty of time before dinner.
   晚餐前我们还有很多时间。
2. They also had a small freezer which they used to whip up some test batches of ice cream.
   他们还有一台小一点的制冰机，是用来试作冰淇淋用的。