Question: Explain why Assumption 3.1 (Full Rank. p. 53) is not necessary for Proposition 3 (Restricted Least Squares). Explain that constraining = Sy+s can be a

Explain why Assumption 3.1

(Full Rank. p. 53) is not necessary for Proposition 3 (Restricted Least Squares). Explain that constraining = Sy+s can be a method of selecting unique fitted coefficients when X is not full rank.

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