Table 1 Summary of the spatially variable-coefficient model. Edf and Ref.df refer to two different ways to compute the numbers of degrees of freedom absorbed by the spatial spline for a model term. TD, PPT_sm and MTWM refer to temperature difference, summer precipitation and temperature of the warmest month. All \(\chi ^2\)-values are significant at \(p < 0.001\)
| Â | edf | Ref.df | \(\chi ^2\) |
|---|---|---|---|
s(y,x) | 43.76 | 47.43 | 330.35 |
s(y,x):TD | 3.00 | 3.00 | 127.58 |
s(y,x):TD2 | 3.00 | 3.00 | 125.35 |
s(y,x):PPT_sm | 32.72 | 37.25 | 301.61 |
s(y,x):PPT_sm2 | 35.32 | 39.39 | 193.43 |
s(y,x):MWMT | 41.68 | 45.75 | 1406.34 |
s(y,x):MWMT2 | 47.78 | 51.37 | 1345.66 |