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Help pages:
| stats::contr.helmert | (Possibly Sparse) Contrast Matrices | |
| stats::contrasts | Get and Set Contrast Matrices | |
| stats::TukeyHSD | Compute Tukey Honest Significant Differences |
| stats::contr.helmert | (Possibly Sparse) Contrast Matrices | |
| stats::contrasts | Get and Set Contrast Matrices | |
| stats::TukeyHSD | Compute Tukey Honest Significant Differences |