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Let W Be the Included Exogenous Variables in a Regression

Question 21

Multiple Choice

Let W be the included exogenous variables in a regression function that also has endogenous regressors (X) . The W variables can

A) be control variables
B) have the property E(u_i|W_i) = 0
C) make an instrument uncorrelated with u
D) all of the above

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