Table 6 Vertical differentiation. Normality tests. Demands
\(\varepsilon\) (\(\Delta\)) | Skewness and kurtosis test | Shapiro–Wilk test | Shapiro–Francia test |
|---|---|---|---|
0.1(0.14) | 0.0037 (0.0674) | 0.00000 (0.13764) | 0.00001 (0.07698) |
0.05(0.09) | 0.0009 (0.0396) | 0.00001 (0.09888) | 0.00002 (0.04154) |
0.01 (0.05) | 0.000 (0.6848) | 0.00000 (0.69446) | 0.00001 (0.55921) |