Hello,

To merge, I needed to make a specific identifier for each row.
As you can see below, for each row,

Code:
clear
input int(ccode1 ccode2 year) float dyad
2 20 1920 2020
2 20 1921 2020
2 20 1922 2020
2 20 1923 2020
2 20 1924 2020
end