Question: A model M has model matrix X. A simpler model M0 results from removing the final term in M, and hence has model matrix X0

A model M has model matrix X. A simpler model M0 results from removing the final term in M, and hence has model matrix X0 that deletes the final column from X. From the definition of a column space, explain why C(X0)

is contained in C(X).

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