Question: Show that 1 1 2 2 k k RSS = ???? SP(X ,Y)+???? SP(X ,Y)+......+???? SP(X ,Y) , where RSS is the regression sum of

Show that 1 1 2 2 k k RSS = ????ˆ SP(X ,Y)+????ˆ SP(X ,Y)+......+????ˆ SP(X ,Y) , where RSS is the regression sum of squares and j SP(X ,Y) is the sum of products between Y and j X (j=1, 2,…,k).

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