Question: Ex. 2.6 Consider a regression problem with inputs x, and outputs y, and a parameterized model fe(x) to be fit by least squares. Show that

Ex. 2.6 Consider a regression problem with inputs x, and outputs

Ex. 2.6 Consider a regression problem with inputs x, and outputs y, and a parameterized model fe(x) to be fit by least squares. Show that if there are observations with tied or identical values of x, then the fit can be obtained from a reduced weighted least squares

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