What is the relationship between a. B1 and b1 b. B2 and b2 c. ui, and ei?

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What is the relationship between
a. B1 and b1
b. B2 and b2
c. ui, and ei? Which of these entities can be observed and how?
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Essentials of Econometrics

ISBN: 978-0073375847

4th edition

Authors: Damodar Gujarati, Dawn Porter

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