[Retracted] Analysis of Stock Market Opening and Environment Protecting Information with Computational Technologies: Evidence from China

Table 4

PSM balance test.

Variable	Sample	Mean (treat = 1)	Mean (treat = 0)	% Bias	t-test	> |t|
Earning	U	0.060	0.034	43.8	27.34	0.001
	M	0.060	0.060	0.1	0.06	0.950
ROE	U	0.088	−0.005	8.1	4.37	0.001
	M	0.088	0.089	−0.1	−0.13	0.896
Growth	U	6.743	4.528	5.9	3.90	0.001
	M	6.743	6.116	1.5	0.77	0.441
Beta	U	1.124	1.158	−11.2	−7.14	0.001
	M	1.124	1.129	0.9	0.46	0.642
Panel B: Sample population mean deviation test
Sample		LR chi2	Mean bias			> chi^2
Unmatched		819.16	17.3			0.001
Matched		0.82	1.1			0.935