Lecture https://ocw.mit.edu/courses/18-06-linear-algebra-spring-2010/resources/lecture-16-projection-matrices-and-least-squares/ Lecture 16: Projection matrices and least squares | Linear Algebra | Mathematics | MIT OpenCourseWare MIT OpenCourseWare is a web based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity ocw.mit.edu N..