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

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Column space

Bra-Ket Notation and Orthogonality

Least Squared Method and Projection Matrix

Answered: (a) i. a basis for Row(A). What is the…

Column Space – Isaac's science blog

Introduction to the Hat matrix in regression

Linear Algebra Video #50: Projection Matrix- Basic Properties Symmetric & Indempotent

Is the image of a matrix the same as its column space? - Quora

What is Column Space? — Example, Intuition & Visualization, by Ms Aerin, IntuitionMath