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Econometrics is a field of statistics dealing with applications to economics.
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Why post main effect being subsumed into the time fixed effects
In the DD equation, I have Treat indicator and Post indicator. The model also includes state fixed effects and year fixed effects. Is it necessary to omit Post variable (thus only Treat and Treat*Post …
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Why post main effect being subsumed into the time fixed effects
There are 2 cases in econometrics that could have collinearity: among each other, or with the fixed-effects. The above example is for the former case. Your questions is on the latter case. …