How is it the Hat matrix spans the column space of X? Really nice.

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How is it the Hat matrix spans the column space of X? Really nice.

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SOLVED: Consider a matrix multiple linear regression problem with an intercept, having the design matrix X = [1n 81 82] ∈ Rnx, where 1n is the all-ones vector. Here, 1n, 81, and

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How is it the Hat matrix spans the column space of X? Really nice.

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