. 2024 Mar 23;10(7):e27857. doi: 10.1016/j.heliyon.2024.e27857

Table 5.

Eigenvalues and Extracted Eigenvectors of the Correlation Matrix for principal component analysis (PCA).

Component	Eigenvalue	Variance%	Cumulative%	PC1	PC2
pH	5.40644	36.04	36.04	0.08	0.18
EC	2.23910	14.93	50.97	0.37	−0.15
TDS	1.74202	11.61	62.58	0.36	−0.14
DO	1.68397	11.23	73.81	0.11	0.11
salinity	1.18672	7.91	81.72	0.38	−0.09
alkalinity	0.93262	6.22	87.94	−0.20	0.42
Ca²⁺	0.58016	3.87	91.81	0.36	0.19
Mg²⁺	0.45061	3.00	94.81	0.29	0.33
Na⁺	0.36301	2.42	97.23	0.32	0.07
K⁺	0.27710	1.85	99.08	0.02	−0.28
Cl⁻	0.10389	0.69	99.77	−0.17	−0.17
NO₃⁻	0.02445	0.16	99.93	0.12	−0.18
HCO₃⁻	0.00754	0.05	99.98	−0.21	0.42
SO₄^2-	0.00161	0.01	99.99	0.02	−0.40
TH	0.00077	0.01	100.00	0.35	0.31