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

Table 7

Multivariate analysis model significance test table^b.

Model	Sum of squares	Degree of freedom	Mean square	F	Significance
Return	2.059	4	0.515	15.102	0.000192b
Residual	0.375	11	0.034
Total	2.434	15

^aDependent variable: effective gas extraction radius. ^bPredictor variable: extraction time, initial permeability of coal seam, extraction negative pressure, and hole diameter.