Table 8 Correlation matrix Eigen value and its corresponding eigenvector of the strongest cumulative effects for multiple air pollutants model
From: Effects of air pollution on neonatal prematurity in guangzhou of china: a time-series study
Principal component | Eigenvalue of correlation matrix | Corresponding eigenvector | |||||
|---|---|---|---|---|---|---|---|
| Â | Eigenvalue | Difference of two eigenvalue | Contribution rate | Accumulated Contribution rate | NO2(3) | PM10(4) | SO2(3) |
Z1 | 2.6592 | 2.4081 | 0.8864 | 0.8864 | 0.5952 | 0.5680 | 0.5684 |
Z2 | 0.2510 | 0.1612 | 0.0837 | 0.9701 | -0.0042 | 0.7095 | -0.7047 |
Z3 | 0.0898 | - | 0.0299 | 1.0000 | -0.8036 | 0.4171 | 0.4246 |