Hi, I am using the following data (Sample). I need to create a panel id which is uniquely identified. I have three trade groups and in every trade group, there is observation from every firm. Please have a look:

Example generated by -dataex-. To install: ssc install dataex
clear
input double gvkey long date byte group double num_trades
1004 19129 1 753
1004 19130 1 984
1004 19130 2 5
1004 19131 1 954
1004 19131 2 1
1004 19134 1 1115
1004 19135 1 1159
1004 19136 3 1
1004 19136 1 1643
1004 19136 2 6
1004 19137 1 945
end
format %d date

I am trying to group gvkey by group or date but unable to have unique ids. Your advice on this will be highly appreciated.

Thanks