Which one of the following statements is true: If E(u|X)# 0, OLS is an inconsistent estimator. If E(u|Z)=0 and Corr(X,Z)# 0, then Z is a valid instrument. b. If E(u|X)=0, you don't need to look for instruments. С. If E(u|X)# 0 and Corr(X,Z) = 0, then Z is not a valid instrument. d. е. All of the above. f. None of the above. a.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Which one of the following statements is
true:
If E(u|X)# 0, OLS is an
а.
inconsistent estimator.
If E(u|Z)=0 and Corr(X,Z)# 0,
then Z is a valid instrument.
b.
If E(u|X)=0, you don't need
look for instruments.
С.
If E(u|X)# 0 and Corr(X,Z) = 0,
then Z is not a valid instrument.
d.
е.
All of the above.
f.
None of the above.
Transcribed Image Text:Which one of the following statements is true: If E(u|X)# 0, OLS is an а. inconsistent estimator. If E(u|Z)=0 and Corr(X,Z)# 0, then Z is a valid instrument. b. If E(u|X)=0, you don't need look for instruments. С. If E(u|X)# 0 and Corr(X,Z) = 0, then Z is not a valid instrument. d. е. All of the above. f. None of the above.
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