| Test | Stem AF | Stem AS | Stem HI |
| N | 25 | 25 | 25 |
| Shapiro–Wilk W | 0.438 | 0.2153 | 0.4168 |
| p(normal) | 9.652 × 10−9 | 1.484 × 10−10 | 6.209 × 10−9 |
| p (Monte Carlo) | 0.0001 | 0.0001 | 0.0001 |
| Conclusion: the three distribution are not Gaussian (normal). We must use a non-parametric test. | |||
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