TABLE 3.

Variable description and statistical description.

Variable name	Symbol	Unit	Calculation method
Green innovation ability	gcreate	piece	perpetual inventory system Calculated stock
Foreign direct investment (FDI)	fdi	Billion dollars	Taking 2006 as the base period Use directly after conversion.
FDI	ofdi	Billion dollars	Taking 2006 as the base period Use directly after conversion.
Foreign trade	trade	Billion dollars	Taking 2006 as the base period Use directly after conversion.
System quality	inst	−	Fully arranged polygon graph Indicator evaluation method
R&D personnel investment	rdp	ten thousand people	Use directly
R&D investment	rd	%	Use directly
Manpower capital	hum	year	Weighted mean number of years of education for population aged 6 and above
Industrial structure adjustment index	ind	%	Annual output value of tertiary industry/annual output value of secondary industry