. tempname resmat
    forvalues i = 1/4 {
    synth cigsale retprice cigsale(1988) cigsale(1980) cigsale(1975) ,
    trunit(`i') trperiod(1989) xperiod(1980(1)1988)
    matrix `resmat' = nullmat(`resmat')  e(RMSPE)
    local names `"`names' `"`i'"'"'
    }
    mat colnames `resmat' = "RMSPE"
    mat rownames `resmat' = `names'
    matlist `resmat' , row("Treated Unit")