3. Appendices

3.1 Appendix 1. Multiple linear regression equation

To more easily give a matrix form to the expressions of the multiple linear regression, we add a first column formed by 1 to the matrix X of the predictive data : $X = [\begin{matrix} 1 & x_{11} & \dots & x_{1 m} \\ 1 & x_{21} & \dots & x_{2 m} \\ \dots & \dots & \dots & \dots \\ 1 & x_{n 1} & \dots & x_{n m} \end{matrix}]$

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