Suppose the x-coordinates of the data (x 1 ; y 1 ),.....(x n , y n )
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Suppose the x-coordinates of the data (x1; y1),.....(xn, yn) are in mean deviation form, so that Σ xi = 0. Show that if X is the design matrix for the least-squares line in this case, then XTX is a diagonal matrix.
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Related Book For 
Linear Algebra And Its Applications
ISBN: 9781292351216
6th Global Edition
Authors: David Lay, Steven Lay, Judi McDonald
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