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colGPA = 0 1 skipped 2 sat u (a) Discuss why skipped might be an endogenous variable here. (b) Suppose we want to use dist,
colGPA = 0 1 skipped 2 sat u (a) Discuss why skipped might be an endogenous variable here. (b) Suppose we want to use dist, which denotes the distance from student's house to lecture hall, as our instrument variable, what assumption we need for dist? Discuss your answer in detail
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