Optimization and Practice for Partition Pressure Relief of Deep Mining Roadway Using Empty-Hole and Deep-Hole Blasting to Weaken Coal

Table 7

Contribution rate analysis of multifactors.

	Pure sum of squares			Contribute rate (%)			Selection
		4.81	84.57	1908.14	49.04	79.23	89.00	4	4	1
	1.63	0.67	0.38	16.66	0.62	0.02	4
	1.84	18.91	227.13	18.82	17.72	10.59	2	1	4
	0.23	0.05	1.01	2.30	0.04	0.05
	1.29	2.55	7.28	13.18	2.38	0.34
SST	9.80	106.74	2143.94				A4B4C1D2