Research on Influencing Factors of Effective Gas Extraction Radius in Coal Mine Based on Multiple Linear Regression

Table 8

Multiple regression coefficient table.

Model	Nonstandardized coefficient		Standardization factor beta	t	Significance	Tolerance	VIF
	B	Standard error
Constant	−0.621	0.302		−2.059	0.064
Hole diameter	0.003	0.002	0.133	1.123	0.286	1.000	1.000
Extraction negative pressure	0.001	0.008	0.011	0.091	0.929	1.000	1.000
Initial permeability of coal seam	0.096	0.021	0.553	4.669	0.001	1.000	1.000
Extraction time	0.006	0.001	0.723	6.111	0.000	1.000	1.000