local i = 20
    while `i'>=0{
    qui by iso_o iso_d: gen byte midm`i'= warint[_n+`i']
    qui by iso_o iso_d: gen byte mid_om`i'= mid_o[_n+`i']
    qui by iso_o iso_d: gen byte mid_dm`i'= mid_d[_n+`i']
    qui by iso_o iso_d: gen byte midp`i'= warint[_n-`i']
    qui by iso_o iso_d: gen byte mid_op`i'= mid_o[_n-`i']
    qui by iso_o iso_d: gen byte mid_dp`i'= mid_d[_n-`i']
    qui replace yrmconf = - `i' if midm`i'==1
    label var midm`i' "bil. MID - `i' years"
    label var midp`i' "bil. MID + `i' years"
    label var mid_om`i' "exporter MID - `i' years"
    label var mid_op`i' "exporter MID + `i' years"
    label var mid_dm`i' "importer MID - `i' years"
    label var mid_dp`i' "importer MID + `i' years"
    di `i'
    local i = `i' - 1
}
end