st: fixed firm and time effects

["Yun Liu" <liuyun3@gmail.com>]

Hi, I have a question about example 13.1, table 13.2 in Greene's
econometric textbook (5th ed.). I know the commands to estimate firm
and time effects separately.
xtreg logc logq logf lf, i(i) fe
xtreg logc logq logf lf, i(t) fe
But how to estimate a model with both firm and period fixed effects in
Stata?  Thank you!

Mel
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