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Introductory Econometrics 4th Edition by Jeffrey Wooldridge
Edition 4ISBN: 978-0324660609Introductory Econometrics 4th Edition by Jeffrey Wooldridge
Edition 4ISBN: 978-0324660609 Exercise 4
Consider the multiple regression model containing three independent variables, under Assumptions MLR.1 through MLR.4:
y = 0 + 1 x 1 + 2 x 2 + 3 x 3 + u.
You are interested in estimating the sum of the parameters on x1 and x2; call this 1 = 1 + 2
(i) Show that
is an unbiased estimator of 1.
(ii) Find Var(
) in terms of Var( 
), Var( 
), and Corr( 
, 
).
y = 0 + 1 x 1 + 2 x 2 + 3 x 3 + u.
You are interested in estimating the sum of the parameters on x1 and x2; call this 1 = 1 + 2
(i) Show that
is an unbiased estimator of 1.(ii) Find Var(
) in terms of Var( ), Var( ), and Corr( , ).Explanation
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Consider the multiple regression model c...
Introductory Econometrics 4th Edition by Jeffrey Wooldridge
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