Hi all,
I want to identify unique string variables within a
subgroup. I pasted a portion of data below.
Specifically I want to find how many locations a
certain code operates in a certain year. I will
appreciate any help.
Thanks
Mazhar
appyear code location
1972 66735 CA
1972 71340 GBX
1972 71340 GBX
1972 71340 GBX
1972 71340 GBX
1972 71340 GBX
1972 71340 GBX
1972 75065 GBX
1972 75065 GBX
1972 76070 JPX
1972 76070 JPX
1972 76070 NJ
1972 76070 NJ
1972 76070 JPX
1972 76070 JPX
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