Define The $\beta _ { 1 } ^ { d i f f - i n - d i f f s }$

question 29

Essay

Define the $\beta _ { 1 } ^ { d i f f - i n - d i f f s }$ in terms of observable differences in the treatment and control group, before and after the treatment. Explain why this presentation is the equivalent of calculating the coefficient in a regression framework.

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