KPCA-ESN Soft-Sensor Model of Polymerization Process Optimized by Biogeography-Based Optimization Algorithm

Table 1

Cumulative contribution ratio of different principal component number.

Principal component number	Percentage of variance (%)	Cumulative percentage of variance (%)
1	59.34	59.34
2	16.49	75.83
3	8.35	84.18
4	6.27	90.45
5	4.91	95.36
6	2.52	97.88
7	1.01	98.89
8	0.59	99.48
9	0.52	100.00
10	0	100.00