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

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Introduction to the Hat matrix in regression

linear algebra - How span of a set containing matrix row is related to the matrix rank? - Mathematics Stack Exchange

Workshop 4: Linear models

Column space

1: Given a set of active functions (top row, hat functions), for

Column space of a matrix (video)

Introduction to the Hat matrix in regression

Hat matrix in bivariate regression

Span, Matrix Column Space

What is the difference in these two column bases? : r/askmath

Locally ordered representation of 3D space in the entorhinal cortex

Let A be a 9×5 matrix of rank 3 . The row space of A

linear algebra - Let A be a m by n matrix, then the row space of matrix A is a subspace of the n-space and the column space a subspace of the