Introduction | Scalar on composition regression | Rice yield data | Regression step with the compositions package | coef | fitted | residuals | Interpretation tools | Finite increments interpretation | Interpretation with ilr coordinates | Interpretation with clr coordinates | Variation scenario in the simplex space | Infinitesimal increments interpretation | Semi-elasticities | Increments approach | Infinitesimal increment: direction pointing to a vertex | Infinitesimal increment: general direction | Composition on scalar regression | Car market data | Regression step | resid | Variation scenario in real space | Infinitesimal Increments approach | Composition on composition regression | Election data | Finite increments | VariationScenario | Infinitesimal increments | Elasticities | Infinitesimal increment: General direction | References