xtreg wage educ experience union i.year, re – Deciding between FE and RE:
xtdescribe To fill in gaps with missing values (use cautiously):
panel variable: country_id (strongly balanced) time variable: year, 2010 to 2011 delta: 1 unit means every panel has the same time periods. If some years are missing, you will see "unbalanced." Handling Unbalanced Panels Unbalanced panels are common (e.g., firms that enter or exit the sample). Stata handles them gracefully, but you must understand the implications for estimation.
xtabond wage experience union, lags(1) maxldep(2) Or the more flexible xtdpdgmm :