TABLE 8.
Validation and cross validation of global and site-specific models
| Validation method |
||||||
|---|---|---|---|---|---|---|
| Leave one out cross validation |
50% sample and 50% control dataset |
|||||
| Site number |
Observed | Predicted | Global model | Site-specific model |
Global model | Site-specific model |
| PM2.5 | ||||||
| 3 | 15.692 ± 1.070(297) | 7.161 ± 1.141(296) | 7.140 ± 1.141 (296; 3.616) |
16.098 ± 1.074 (296; 1.842) |
7.605 ± 1.190 (148; 3.251) |
17.151 ± 1.092 (148; 1.777) |
| 7 | 8.743 ± 1.095(250) | 8.336 ± 1.117(249) | 8.332 ± 1.117 (249; 2.172) |
8.993 ± 1.108 (249; 2.102) |
7.926 ± 1.178 (116; 2.100) |
8.383 ± 1.181 (116; 2.132) |
| 17 | 10.879 ± 1.088(405) | 10.984 ± 1.086(406) | 10.984 ± 1.087 (406; 2.342) |
10.772 ± 1.099 (406; 2.493) |
10.260 ± 1.129 (226; 2.424) |
9.500 ± 1.144 (226; 2.585) |
| 20 | 6.082 ± 1.097(545) | 10.090 ± 1.080(545) | 10.098 ± 1.080 (545; 2.960) |
6.593 ± 1.113 (545; 3.102) |
9.102 ± 1.119 (283; 2.910) |
5.319 ± 1.166 (283; 3.178) |
| 60 | 12.791 ± 1.107(218) | 21.129 ± 1.085(222) | 21.163 ± 1.085 (222; 2.399) |
12.971 ± 1.147 (222; 2.598) |
22.230 ± 1.122 (114; 2.360) |
14.614 ± 1.218 (114; 2.702) |
| All sites | 9.528 ± 1.046(1715) | 10.385 ± 1.047(1718) | 10.384 ± 1.047 (1718; 2.741) |
9.858 ± 1.052 (1718; 2.535) |
10.031 ± 1.067 (887; 2.668) |
9.060 ± 1.079 (887; 2.601) |
| PM10 | ||||||
| 14 | 18.144 ± 1.075(254) | 19.449 ± 1.119(254) | 19.433 ± 1.120 (254; 2.231) |
18.127 ± 1.113 (254; 2.128) |
21.145 ± 1.198 (119; 2.484) |
20.561 ± 1.168 (119; 2.183) |
| 17 | 20.474 ± 1.072(286) | 17.746 ± 1.097(286) | 17.730 ± 1.097 (286; 1.990) |
20.218 ± 1.107 (286; 2.055) |
18.148 ± 1.171 (132; 2.220) |
21.561 ± 1.207 (132; 2.508) |
| 60 | 25.831 ± 1.064(387) | 27.439 ± 1.061(388) | 27.446 ± 1.061 (388; 1.969) |
26.059 ± 1.074 (388; 2.102) |
28.179 ± 1.098 (174; 2.031) |
25.299 ± 1.133 (174; 2.344) |
| All sites | 21.789 ± 1.041(930) | 21.834 ± 1.051(931) | 21.826 ± 1.052 (931; 2.048) |
21.819 ± 1.055 (928; 2.095) |
22.671 ± 1.085 (426; 2.217) |
22.688 ± 1.093 (426; 2.348) |
Note: PM concentration ± 95% CI (µg/m3).In parentheses (number of data points used; RMSE).