[Retracted] Foreign Direct Investment, Regional Innovation, and Green Economic Efficiency: An Empirical Test Based on the Investigation of Intermediary Effect and Threshold Effect

Table 6

The threshold value estimation and test.

The threshold is set up variables	Number of thresholds	Threshold	The F value	10%	5%	1%	The 95% confidence interval
LnGDPit	Single	8.748	42.9450	8.484	15.724	32.288	[8.748,8.819]
	Double	8.748; 9.373	20.2960	3.474	4.628	7.604	[8.748,8.819]; [9.250,9.373]
	Three	9.118	0.0000	0.000	0.000	0.000	[9.027,9.124]