Suppose you are trying to estimate the following regression: Yi = ?0 + ?1X1i + ?2X2i + ?3X3i + Ui, with an instrument for Zi for X2i. All of the following variables will be included (on the right- and left-hand side of this regression) in the first stage of two-stage least squares except for which one?

A. Yi
B. X2i
C. X1i
D. X3i


Answer: A

Biology & Microbiology

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