Table 3. Comparisons of model validation results for mean temperature, minimum temperature, maximum temperature and relative humidity based on leave-one-out approach.
Spatial interpolation method | Response variable and fixed factors used | MAE | CV | COR |
---|---|---|---|---|
Larger MAE and CV values indicate worse fits, while larger COR values indicate better fit. |
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Mean temperature |
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Thin Plate Spline | None | 3.85 | 0.21 | 0.38 |
Altitude | 1.67 | 0.09 | 0.90 | |
Altitude, distance to ocean | 1.75 | 0.1 | 0.88 | |
Altitude, CPC temp | 3.58 | 0.19 | 0.66 | |
Altitude, Worldclim temp | 1.21 | 0.07 | 0.95 | |
Ordinary kriging | Altitude, Worldclim temp, CPC temp | 1.23 | 0.07 | 0.94 |
None | 3.45 | 0.21 | 0.43 | |
Altitude, Worldclim temp | 1.09 | 0.06 | 0.96 | |
Altitude, Worldclim temp, CPC temp | 1.13 | 0.06 | 0.95 | |
Minimum temperature |
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Ordinary kriging | Altitude, Worldclim temp | 1.26 | 0.08 | 0.95 |
Altitude, interpolated mean temp. | 1.13 | 0.07 | 0.96 | |
Altitude, Worldclim temp, interpolated mean temp. | 1.46 | 0.1 | 0.93 | |
Maximum temperature |
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Ordinary kriging | Altitude, Worldclim temp | 1.54 | 0.07 | 0.92 |
Altitude, interpolated mean temp. | 2.02 | 0.1 | 0.85 | |
Altitude, Worldclim temp, interpolated mean temp. | 2.03 | 0.1 | 0.85 | |
Relative humiditya |
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Ordinary kriging | Altitude, Worldclim temp | 5.49 | 0.3 | 0.86 |
Altitude, interpolated mean temp. | 1.40 | 0.1 | 0.92 | |
Altitude, Worldclim temp, interpolated mean temp. | 1.46 | 0.1 | 0.91 |
aDerived using Equation 3.