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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

From: Effects of long-term deforestation and remnant forests on rainfall and temperature in the Central Rift Valley of Ethiopia

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*
  1. • R 2, coefficient of multiple determinations
  2. *indicates the Significance at P < 0.05 (95% confidence interval)
  3. Standard error values are listed beneath the corresponding predictor terms