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Somebody posted this link here about DERIVATION OF THE LEAST SQUARES ESTIMATOR FOR BETA IN MATRIX NOTATION-(https://economictheoryblog.com/2015/02/19/ols_estimator/). My question is 'How does THE LEAST SQUARES ESTIMATOR FOR BETA IN MATRIX NOTATION relate to NORMAL EQUATIONS and ORTHOGONAL PROJECTION' I would love examples too with maybe n=6 and k=3

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marked as duplicate by whuber regression May 16 at 20:36

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