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