Table 2.

Descriptive statistics of variables.

Variable	N	Mean	SD	Min	Max
HE	300	0.651	0.539	0.165	0.856
DE	300	0.938	1.278	−1.023	6.958
GDP	300	2.484	2.054	0.137	11.115
OPEN	300	0.200	0.342	0.003	2.745
PAT	300	5.860	8.937	0.050	70.973
POP	300	45.998	28.378	5.680	126.240
URB	300	0.590	0.122	0.350	0.896