Prediction Model for Spontaneous Combustion of Coal around Boreholes Using Bedding Gas Drainage

Table 5

Coefficients of the relevant variables.

Model		Unnormalized coefficient		Normalized coefficient	t	Significance
		B	Standard error	Beta
8	(Constant)	−0.797	0.202		−3.953	0.003
	ZP^2	0.558	0.144	0.383	3.876	0.004
	ZFs	0.549	0.099	0.549	5.555	0.000
	ZP1	−0.367	0.106	−0.367	−3.457	0.007
	ZFc	0.494	0.101	0.494	4.898	0.001
	ZTc^2	0.292	0.123	0.235	2.378	0.041
	ZFsZTc	−0.225	0.112	−0.218	−2.019	0.074