Table 3.
Performance comparison of alternative kriging estimators: kriging variance and smoothing effect.
| Estimators | Lung cancer | Cervix cancer | ||
| Kriging variance | Dispersion variance | Kriging variance | Dispersion variance | |
| Point kriging of raw rates | 9.691 | 5.536 | 2.724 | 1.726 |
| Point kriging of global EBS | 3.423 | 2.934 | 0.314 | 0.281 |
| Point kriging of local EBS | 3.307 | 2.902 | 0.237 | 0.448 |
| ATP Poisson kriging | 9.378 | 8.401 | 0.645 | 0.926 |
| ATP Poisson kriging (true γR(h)) | 9.470 | 8.654 | 0.849 | 1.089 |
Results obtained on average over 100 realizations generated for Regions 1 and 2. The dispersion variance refers to the variance of risk estimates. Poisson kriging was conducted with the semivariogram model derived through deconvolution or inferred directly from the simulated grid risk values (true point-support model γR(h)).