Table 5.

Estimation results of gravity model parameters and Pearson’s correlation between economic gravity and investment frequency.

Year	Gravity model parameters		Pearson’s correlation
	k	β	Overall	0–100	100–500	>500
2000	0.0010000	0.4780	0.608	0.763	0.730	0.496
2005	0.0002511	0.3897	0.708	0.850	0.769	0.636
2010	0.0001548	0.4784	0.708	0.869	0.783	0.610
2015	0.0001345	0.4804	0.691	0.899	0.797	0.588
2020	0.0001984	0.4775	0.740	0.911	0.763	0.668