2.4 Statistical analysis
The geomorphic parameters (HL , A , Pe , andHDC ) and indices (CC , FF , RR , LR , andHI ) of the catchments were grouped according to the Rift margin and Valley floor derivations. Normality of each soil parameter in each group was tested with the Kolmogorov-Smimov test (α = 0.05) and the Shapiro-Wilk test (α = 0.05), and homogeneity of variance was tested with the Levene test (α = 0.05). For the parameters and indices that were tested for normality and homogeneity of variance, a t-test was applied to detect differences in the mean values between the two groups; otherwise, a non-parametric test was applied. SPSS ver. 20 (IBM) was used for the statistical analyses.
RESULTS