Table 2 Descriptive statistics.

Variable	Mean	Median	Maximum	Minimum	Std. Dev.	Skewness	Kurtosis	Jarque-Bera	Probability
North China
CO₂	14.420	14.513	14.740	13.973	0.223	–0.600	2.392	1.131	0.568
CCPU	7.035	7.042	7.562	6.282	0.373	–0.742	3.101	1.383	0.501
EC	11.233	11.311	11.455	10.856	0.174	–0.832	2.610	1.826	0.401
GDP	11.178	11.354	11.685	10.276	0.465	–0.688	2.116	1.670	0.434
Northeast China
CO₂	13.660	13.750	13.831	13.273	0.168	–1.083	2.939	2.933	0.231
CCPU	7.035	7.042	7.562	6.282	0.373	–0.742	3.101	1.383	0.501
EC	10.560	10.629	10.730	10.203	0.155	–1.174	3.170	3.463	0.177
GDP	10.573	10.771	10.965	9.752	0.410	–0.839	2.269	2.095	0.351
Eastern China
CO₂	14.759	14.840	14.992	14.372	0.184	–0.766	2.491	1.628	0.443
CCPU	7.035	7.042	7.562	6.282	0.373	–0.742	3.101	1.383	0.501
EC	11.665	11.736	11.886	11.271	0.189	–0.778	2.423	1.723	0.423
GDP	12.151	12.249	12.836	11.233	0.509	–0.384	1.945	1.065	0.587
Southcentral China
CO₂	14.352	14.436	14.509	13.965	0.166	–1.098	3.013	3.013	0.222
CCPU	7.035	7.042	7.562	6.282	0.373	–0.742	3.101	1.383	0.501
EC	11.368	11.456	11.545	10.969	0.182	–0.996	2.703	2.536	0.281
GDP	11.797	11.898	12.521	10.844	0.528	–0.375	1.957	1.030	0.597
Southwest China
CO₂	13.599	13.701	13.751	13.181	0.186	–1.100	2.788	3.054	0.217
CCPU	7.035	7.042	7.562	6.282	0.373	–0.742	3.101	1.383	0.501
EC	10.671	10.760	10.864	10.255	0.201	–0.875	2.366	2.165	0.339
GDP	10.749	10.868	11.610	9.700	0.611	–0.288	1.855	1.026	0.599
Northwest China
CO₂	13.507	13.648	13.981	12.846	0.379	–0.465	1.768	1.491	0.475
CCPU	7.035	7.042	7.562	6.282	0.373	–0.742	3.101	1.383	0.501
EC	10.444	10.533	10.853	9.886	0.326	–0.337	1.684	1.366	0.505
GDP	10.200	10.369	10.912	9.172	0.563	–0.487	1.923	1.318	0.517

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