Table 6 Correlation matrix eigenvalues of multiple air pollutants model on day 0 and corresponding eigenvector
From: Effects of air pollution on neonatal prematurity in guangzhou of china: a time-series study
Principal component | Correlation matrix eigenvalue | Corresponding eigenvector | |||||
|---|---|---|---|---|---|---|---|
| Â | Eigenvalue | Difference of two eigenvalue | Contribution rate | Accumulated Contribution rate | NO2(0) | PM10(0) | SO2(0) |
Z1 | 2.6317 | 2.3804 | 0.8772 | 0.8772 | 0.5925 | 0.5708 | 0.5684 |
Z2 | 0.2513 | 0.1344 | 0.0838 | 0.9610 | -0.0310 | -0.6890 | 0.7241 |
Z3 | 0.1170 | - | 0.0390 | 1.0000 | -0.8050 | 0.4467 | 0.3906 |