How can I replace the missing data value with the existing repeated values by city!
clear
input int city double grp
1100 .
1100 .
1100 .
1100 .234
1100 .
1100 .234
1100 .
1230 .5
1230 .
1230 .
1230 .
1230 .5
1230 .
1323 .
1323 .
1323 .
1323 .3
1323 .
1323 .
1323 .3
1323 .
1323 .
1323 .
end
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