* Check the pattern of missing data xtdescribe * Tabulate the distribution of observations per unit xtsum Use code with caution. Dealing with Duplicates
* Install the Mundlak package if you don't have it * ssc install mundlak mundlak y x1 x2, fe Use code with caution. stata panel data exclusive
If you want, I can:
Download xtabond2 (ssc install xtabond2) — a must for dynamic panels. * Check the pattern of missing data xtdescribe