Derivation of the Ordinary Least Squares Estimator

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. With these elements, the sum of squares equals 22 + 42 + 62 = 56. In matrix notation, d and d’ are ................
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