lm() for did model

General
1

Dear all,

I wanted to ask if I use the correct function to set-up the model for a did:

did=time*treated

didreg = lm(y ~ time + treated+ did + x + factor(year) + factor(firm), data = sample)

the data looks like:

image

2

I think yes. See more here: https://www.princeton.edu/~otorres/DID101R.pdf

3

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