Table 5 Best regression models based on stepwise regression showing the relationships between mean annual rainfall and number of rainy days (1970–2009) as dependent variables and slope and elevation as explanatory variables in the Central Rift Valley
40-year data (1970–2009) | |||
|---|---|---|---|
Dependent variables | Model | R 2 | P |
Annual rainfall (mm) | Rainfall = 50.47 × slope + 756.16 | 0.29 | 0.03* |
Annual number of rainy days | Number of rain days = 0.048 × elevation +6.60 × slope - 13 | 0.60 | Slope = 0.048* Elevation = 0.006* |
Two-year data (2012–2013) |  |  |  |
Annual rainfall (mm) | Y = 0.69 × elevation - 529.94 | 0.26 | 0.05 |
Annual number of rainy days | Y = −1.77 × distance to forest +173.49 | 0.40 | 0.01* |