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

❖ The Span of a Set of Vectors ❖

Hat matrix in bivariate regression

What is the importance of hat matrix, $H=X(X^ op X)^{-1} X^ op

Projections onto Subspaces

3Blue1Brown - Inverse matrices, column space and null space

Vector spaces induced by matrices: column, row, and null spaces

Econometrics

Introduction to the Hat matrix in regression

The Column Space of a Matrix

Column Span and Row Span of a Matrix