Question: Question 20 (2 points) Choose one correct statement. J-statistic is used for testing weak instrument. OJ-statistic cannot be used when the model is over-identified. J-statistic

Question 20 (2 points) Choose one correct statement. J-statistic is used

for testing weak instrument. OJ-statistic cannot be used when the model is

Question 20 (2 points) Choose one correct statement. J-statistic is used for testing weak instrument. OJ-statistic cannot be used when the model is over-identified. J-statistic cannot be used when the model is exactly-identified. ()J-statistic can be used when the model is under-identified

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