Emission Reduction Effect and Mechanism of Auto-Purchase Tax Preference

Table 10

RDD results for different cities.

	(1)	(2)		(3)	(4)
	Local linear regression			Local polynomial regression
	Developed cities	Developing cities		Developed cities	Developing cities
D	0.981	2.221	T	0.950	3.078
	(0.1771)	(0.1036)		(0.3877)	(0.2384)
Date	0.0157	0.0147	x	−0.0156	−0.222
	(0.0072)	(0.0031)		(0.0581)	(0.0252)
Ddate	−0.0868	−0.194	Tx	0.0630	−0.0566
	(0.0161)	(0.0088)		(0.2166)	(0.1237)
			x^2	−0.0145	−0.0623
				(0.0115)	(0.0049)
			Tx^2	−0.0300	0.0218
				(0.0348)	(0.0191)
			x^3	−0.00109	−0.00391
				(0.0006)	(0.0003)
			Tx^3	0.00399	0.00751
				(0.0017)	(0.0009)
Constant	5.447	3.799	_Cons	5.518	3.687
	(0.0297)	(0.0126)		(0.0845)	(0.0377)
Obs	13731	63842	Obs	13731	63842
			AIC	63166.2077	2.864e + 05

Note: t statistics are in parentheses. ^∗ < 0.10, ^∗∗ < 0.05, and ^∗∗∗ < 0.01.