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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Environ Ecol Stat. 2013 Aug 30;21(3):411–433. doi: 10.1007/s10651-013-0261-4

Table 6.

Cross-validation results for the model without and with Caline, but excluding all road covariates. The table gives RMSE, R2, and coverage for 95% predictions intervals for the out-of-sample predictions. For the Home sites the three adjusted R2:s, showing improvement over simple temporal models, are also provided. All values are computed on the back transformed scale (ppb NOx)

Without road covariates
No Caline Caline
RMSE R 2 cov. RMSE R 2 cov.
AQS and MESA fixed
 2-week 20.42 0.74 0.91 18.40 0.79 0.92
 long-term avg. 15.77 0.27 12.74 0.52
Snapshot
 2006-07-05 9.68 0.29 0.93 8.26 0.48 0.95
 2006-10-25 16.51 0.51 0.98 14.90 0.60 0.95
 2007-01-31 20.45 0.43 0.98 18.19 0.55 0.96
Home sites 11.00 0.85 0.97 9.31 0.89 0.95
 average 0.54 0.67
 closest 0.65 0.75
 smooth 0.64 0.75