7. Regression analysis

Once the significant influence of a factor (or interaction) has been demonstrated in the case of systematic selection of the levels of the controlled factor, it is natural to look for a function representing the phenomenon. The most frequent case is that of a monotonic function (increasing or decreasing), which can always be – by means of an anamorphosis, or – represented as a linear function. For example, the parabola y = ax ² becomes a straight line y = at by setting

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