clear
cd c:\chililabdata\data
use inmigration
replace img_date=img_date/86400000
format img_date %td
gen round = substr(observeid, 10,3)
gen socialkey = socialgpid+  round
gen individkey = individid+  round
drop  EID  socialgpidGuid   eventid observeid 
duplicates drop individkey, force
sort individkey
save ..\newcode\data\std_inmigration, replace