Proofs involving ordinary least squares

The purpose of Proofs involving ordinary least squares page is to provide supplementary materials for the ordinary least squares article, reducing the load of the main article with mathematics and improving its accessibility, while at the same time retaining the completeness of exposition. == Derivation of the normal equations == Define the i {\displaystyle i} th residual to be r i = y i − ∑ j = 1 n X i j β j .

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