[Retracted] The Impact of Innovative Industrial Cluster Policy on Regional Innovation: Evidence from a Quasi-Natural Experiment in China

Table 3

The result of PSM matching.

Variables	Unmatched/matched	Mean		Bias (%)	Reduct |bias| (%)	t-test
		Treated group	Control group			t-statistics
Eco	U	1.7153	1.2088	83.5	96.8	18.67	0.000
	M	1.7138	1.6978	2.6		0.51	0.713
Open	U	0.0260	0.0153	57.0	92.9	13.72	0.000
	M	0.0259	0.0252	4.0		0.67	0.504
Fin	U	2.6048	2.1634	37.3	94.2	8.82	0.000
	M	2.6033	2.5776	2.2		0.39	0.695
Pop	U	6.2109	5.7786	63.3	95.7	14.29	0.000
	M	6.2099	6.2285	−2.7		−0.52	0.604
Hum	U	5.3232	4.3080	103.1	99.9	23.00	0.000
	M	5.3206	5.3197	0.1		0.02	0.985
Int	U	0.2736	0.3893	−12.5	32.5	−2.54	0.011
	M	0.2740	0.1958	8.5		2.62	0.009