Influencing Factors’ Analysis of Disturbance Degree of Key Stratum Based on the Response Surface Method

Table 5

Variance results of the regression model.

Scheme number	Origins	Sum of squares	Freedom	Mean square	F valued	valued
1 (soft)	Model	2.12	9	0.2357	17.72	0.0005
	Mining height	0.363	1	0.363	27.29	0.0012
	Buried depth	0.1311	1	0.1311	9.85	0.0164
	Interlayer spacing	0.9941	1	0.9941	74.73	0.0001
	Residual error	0.0931	7	0.0133
	Summation	2.21	16
2 (medium)	Model	0.8113	9	0.0901	17.7	0.0005
	Mining height	0.1386	1	0.1386	27.22	0.0012
	Buried depth	0.0501	1	0.0501	9.84	0.0165
	Interlayer spacing	0.3802	1	0.3802	74.67	0.0001
	Residual error	0.0356	7	0.0051
	Summation	0.8469	16
3 (hard)	Model	0.0684	9	0.0076	17.54	0.0005
	Mining height	0.0038	1	0.0038	8.65	0.0217
	Buried depth	0.0019	1	0.0018	4.15	0.0809
	Interlayer spacing	0.0088	1	0.0088	20.3	0.0028
	Residual error	0.003	7	0.0004
	Summation	0.0715	16