Table 2 Fitting parameters of the PM2.5 concentration variogram.
From: Heterogeneity and the determinants of PM2.5 in the Yangtze River Economic Belt
Year | A0 (km) | C0 | C0 + C | C0/(C0 + C) | R2 | Residual sum of squares | Optimal fitting model |
|---|---|---|---|---|---|---|---|
2000 | 625.27 | 0.0029 | 0.0543 | 0.0534 | 0.960 | 2.061E−04 | Gaussian |
2007 | 737.85 | 0.0036 | 0.0492 | 0.0732 | 0.963 | 1.444E−04 | Gaussian |
2017 | 635.66 | 0.0011 | 0.0484 | 0.0227 | 0.987 | 5.271E−05 | Gaussian |
