Prove that ei i = 0, that is, that the sum of the product of residuals ei

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Prove that ∑ei Ŷi = 0, that is, that the sum of the product of residuals ei and the estimated Yi is always zero.
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Essentials of Econometrics

ISBN: 978-0073375847

4th edition

Authors: Damodar Gujarati, Dawn Porter

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