Multimodal Control by Variable-Structure Neural Network Modeling for Coagulant Dosing in Water Purification Process

Table 2

The first eight principal components’ eigenvalue and variance contribution by PCA in one computation.

Principal components	Eigenvalue	Variance contribution (percent)	Accumulated variance contribution (percent)
1	20.1607660138651	33.6012766897752	33.6012766897752
2	14.1382412479112	23.5637354131853	57.1650121029605
3	9.55968664322995	15.9328110720499	73.0978231750104
4	5.33738215800062	8.89563693000104	81.9934601050114
5	4.28516886114769	7.14194810191281	89.1354082069243
6	1.83532313856500	3.05887189760834	92.1942801045326
7	1.24409369821930	2.62008336345786	94.2677696015648
8	0.895336966029005	1.49222827671501	95.7599978782798