Question: While calculating a difference in difference, we run a regression which is as follows: lm( y ~ d1 +d2 + d3) where d1 and d2

While calculating a difference in difference, we run a regression which is as follows:

lm( y ~ d1 +d2 + d3) where d1 and d2 are dummy variables and d3 is their interaction term.

We thus get its coefficients according to the equation: Y = a + b*d1 + c*d2 + d*d3

What is the difference in difference estimator?

a) a+b+c+d

b) (d-c)-(b-a)

c) a

d) b

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