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Thank you! fProve that the matrices H and I H are idempotent, that is, HH = H and (IH)(IH)=IH (4) Do problem 3.28, pp. 127

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\fProve that the matrices H and I H are idempotent, that is, HH = H and (IH)(IH)=IH

(4) Do problem 3.28, pp. 127 in the text. Note H = X (XT X) IXT .

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