pdch: A Stata package that helps to check panel data across waves
pdch shows observations from all waves if the specified condition is satisfied at any waves.
Example:
use http://www.stata-press.com/data/r13/nlswork , clear
xtdes // idcode = personal identifier; year = wave
// Show all-wave records for respondents who has ever worked at industry 5
order idcode year ind_code
pdch ind_code == 5, by(idcode) sort(year)
// sort is optional