Linear Least Squares - Stanford University

after dividing by 2. These normal equations can also be written Z0Z ^ = Z0Y: (2.4) When Z0Zis invertible then we nd that ^ = (Z0Z) 1Z0Y: (2.5) We’ll suppose at rst that Z0Zis invertible and then consider the singular case in Chapter 2.7. Equation (2.5) underlies another meaning of the work ‘linear’ in linear … ................
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