Which of the following best characterizes the conditions for a good instrument? A. Z needs to be included in both stages in order for 2SLS to be appropriate. B. Z is statistically significant in the...


Which of the following best characterizes the conditions for a good instrument?
























A.
Z needs to be included in both stages in order for 2SLS to be appropriate.

B.
Z is statistically significant in the first-stage and exerts a direct effect on Y.

C.
Z is statistically significant in the first-stage and exerts no direct effect on Y.

D.
Z is uncorrelated with both X and Y.



Jun 09, 2022
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