Synthetic Control Method Error message: variable X does not uniquely identify observations in the using data

[Kenta Kunte]

Hi experts,

I am trying to investigate the impact of the coup that happened in 1980 on the economy of Liberia through utilizing the synthetic control method.

I have obtained the result using the following command which might look better fit, and am trying to how better the synthetic fits the treatment using the following command. However I got an error message like this.

"variable country_id does not uniquely identify observations in the using data"

tsset country_id year

synth rgdpe hc(1970&1975) pop(1970&1975) rconna(1970&1975) csh_i(1970&1975) csh_x(1970&1975) cn(1970&1975), trunit(22) trperiod(1980) keep("liberia") replace fig

synth_asmd, trunit(22) trperiod(1980) depvar( rgdpe ) data("liberia")

Can anyone please give me a remedy? Furthermore, I am struggling with the other case of the SCM method to create a better synthetic for another coup case, it would be also appreciated if you experts helped me out. (the link is attached)




Thank you and sincerely,