Pooling independent cross sections across time is useful in providing precise estimators if _____.
A) the relationship between the dependent variable and at least some of the independent variables remains constant over time
B) the relationship between the dependent variable and at least some of the independent variables is linear
C) the relationship between the dependent variable and at least one of the independent variables changes over time
D) the relationship between the dependent variable and at least one of the independent variables is positive
Correct Answer:
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