Study on Prediction of Coal-Gas Compound Dynamic Disaster Based on GRA-PCA-BP Model

Table 5

Total variance explained.

Total variance explained
	Initial eigenvalue			Extract the sum of squares of the load
Common factor	Total	Variance percentage	Cumulative percentage	Total	Variance percentage	Cumulative percentage
1	2.551	31.886	31.886	2.551	31.886	31.886
2	1.371	17.143	49.029	1.371	17.143	49.029
3	1.311	16.386	65.415	1.311	16.386	65.415
4	0.983	12.289	77.703	0.983	12.289	77.703
5	0.715	8.936	86.639
6	0.579	7.243	93.882
7	0.256	3.203	97.086
8	0.233	2.914	100