Variable | Classes | Variable description | Estimate (β) | Std. Error | z value | Pr (>|z|) |
Intercept (α) | −5.40 | 0.15 | −36.82 | <0.01 | ||
Aspect (˚) | 2 | 90 - 180 | −0.44 | 0.03 | −12.33 | <0.01 |
3 | 180 - 270 | −0.66 | 0.04 | −17.97 | <0.01 | |
4 | 270 - 360 | 0.10 | 0.03 | 3.10 | <0.01 | |
Land Use | 2 | Permanent crops | −1.71 | 0.14 | −12.26 | <0.01 |
3 | Agricoltural areas | −0.66 | 0.13 | −5.08 | <0.01 | |
4 | Forests | −0.79 | 0.12 | −6.33 | <0.01 | |
5 | Scrub and/or herbaceous vegetation | −0.30 | 0.13 | −2.42 | 0.01 | |
6 | Open spaces with little or no vegetation | 0.20 | 0.16 | −1.31 | 0.19 | |
DTM (m a.s.l.) | 2 | 700 - 900 | −0.85 | 0.05 | −16.73 | <0.01 |
3 | 900 - 1100 | −1.00 | 0.05 | −20.24 | <0.01 | |
4 | 1100 - 1300 | −1.66 | 0.06 | −28.91 | <0.01 | |
5 | 1300 - 1500 | −2.07 | 0.07 | −29.76 | <0.01 | |
6 | 1500 - 2150 | −2.09 | 0.09 | −23.29 | <0.01 | |
Slope (˚) | 2 | 5 - 10 | 1.51 | 0.09 | 17.15 | <0.01 |
3 | 10 - 20 | 2.26 | 0.08 | 28.01 | <0.01 | |
4 | 20 - 30 | 2.08 | 0.08 | 25.33 | <0.01 | |
5 | 30 - 40 | 2.30 | 0.09 | 26.67 | <0.01 | |
6 | 40 - 50 | 2.98 | 0.10 | 29.43 | <0.01 | |
7 | 50 - 75 | 2.47 | 0.24 | 10.34 | <0.01 | |
Lithology | 2 | Quaternary cemented deposits | 0.86 | 0.11 | 8.14 | <0.01 |
3 | Flysch deposits | 0.76 | 0.06 | 13.46 | <0.01 | |
4 | Marly limestones | 0.86 | 0.06 | 15.16 | <0.01 | |
5 | Marls and clay marls | 2.10 | 0.09 | 23.62 | <0.01 | |
6 | Limestones, marls and clays alternations | 1.10 | 0.06 | 17.21 | <0.01 | |
7 | Stratified limestone | −0.18 | 0.06 | −3.02 | <0.01 | |
8 | Dolomite | 1.18 | 0.08 | 14.05 | <0.01 |