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In biostatistics, fixed-effects may mean population-average effects. In econometrics, fixed-effects may represent the observed quantities in terms of explanatory variables that are treated as if the quantities were non-random.
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How to interact an across panel unit in fixed effect model?
This is fine. I guess you meant to say that female does not vary across time, $t$, not across users, $id$. Because your experience varies across time, the new variable, $1.female*c.experience$ will no …
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Heterogenous effects in DID models
Simply adding dummies will shift your intercept, but if you believe some sectors follow a much stronger relationship than others, you can add the interaction of the sector dummies with the variable of …
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Including Time Invariant Covariates in a Random Intercept Model
As long as the variable $x_i$ varies across $i$, meaning there are deviations from the mean that will help in explaining or shifting the regression line, it does not need to vary across $t$ for it to …