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Table 3 Evaluation of spatiotemporal IDW interpolation and linear regression models to predict annual historical air pollution.

From: Spatiotemporal air pollution exposure assessment for a Canadian population-based lung cancer case-control study

     IDW Interpolation Linear Models
  Year Stations N R2 RMSE R2 RMSE
NO 2 All 120 1030 0.22 6.66 0.38 5.92
  1994-1990 94 349 0.30 5.66 0.36 5.42
  1989-1985 88 300 0.20 6.61 0.44 5.54
  1984-1980 62 226 0.13 6.72 0.40 5.62
  1979-1975 52 155 0.17 8.75 0.29 8.07
PM 2.5 All 177 1826 0.51 2.96 0.30 3.53
  1994-1990 106 446 0.64 1.96 0.32 2.70
  1989-1985 113 480 0.57 2.30 0.36 2.81
  1984-1980 124 476 0.34 3.79 0.12 4.36
  1979-1975 123 424 0.43 3.32 0.26 3.77
O 3 All 187 1440 0.39 5.29 0.56 4.48
  1994-1990 158 582 0.53 4.92 0.65 4.25
  1989-1985 125 409 0.36 5.41 0.54 4.57
  1984-1980 80 286 0.25 4.67 0.28 4.57
  1979-1975 48 163 0.22 6.33 0.60 4.50