Derivation of the Ordinary Least Squares Estimator

The following example illustrates why this definition is the sum of squares. Example Sum of Squared Errors Matrix Form. To show in matrix form, the equation d’d is the sum of squares, consider a matrix d of dimension (1 x 3) consisting of the elements 2, 4, 6. Also, recall by taking the transpose, the rows and columns are interchanged. ................
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