Lecture 13: Simple Linear Regression in Matrix Format
The matrix inversion and multiplication then handles all the book-keeping to put these pieces together to get the appropriate (sample) variances, ... If we project a vector u on to the line in the direction of the length-one vector v, we get vvTu (39) (Check the dimensions: u and v are both n 1, so vT is 1 n, and vTu is
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