Derivation of the Ordinary Least Squares Estimator

Algebraic Properties of the OLS Estimator. Several algebraic properties of the OLS estimator are shown here. The importance of these properties is they are used in deriving goodness-of-fit measures and statistical properties of the OLS estimator. Algebraic Property 1. Using the FOC w.r.t. it can be shown the sum of the residuals is equal to ... ................
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