A Comprehensive Method for Water Environment Assessment considering Trends of Water Quality

Table 7

Eigenvalues and percentage of explained variance by PCA.

Component	Eigenvalue	Variance (%)	Cumulative variance (%)
1	6.862	76.240	76.240
2	1.088	12.090	88.330
3	0.656	7.288	95.617
4	0.229	2.541	98.158
5	0.084	0.930	99.088
6	0.051	0.570	99.659
7	0.020	0.219	99.878
8	0.010	0.107	99.985
9	0.001	0.015	100.000