question archive which one is incorrect about the proxy variable?A
which one is incorrect about the proxy variable?A
Subject:EconomicsPrice: Bought3
which one is incorrect about the proxy variable?A. it must be correlated with the unobserved variable
B. it must be uncorrelated with the error term in the population
C. is can be used in the population regression model together
D. it does not belong to the population regression model
