How Snowfalls Affect the Operation of Taxi Fleets? A Case Study from Harbin, China

Table 2

Results of the unit root test.

	Test form	ADF value	Critical value			value	Conclusion
			1%	5%	10%
Y	(C, 0, 1)	−4.331	−3.546	−2.912	−2.594	0.001	Stationary
X	(C, 0, 0)	−5.158	−3.544	−2.911	−2.593	0.000	Stationary