Improved GSO Optimized ESN Soft-Sensor Model of Flotation Process Based on Multisource Heterogeneous Information Fusion

Table 3

Contribution rate of principle component.

Number of principal components	Percentage of variance (%)	Cumulative percentage of variance (%)
1	45.72	45.72
2	21.82	67.52
3	13.42	80.94
4	7.14	88.08
5	2.15	90.23
⋮	⋮	⋮
21	0.07	100.00