synth help 对安慰剂检验的代码描述是:
. 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")
其中synth cigsale retprice cigsale(1988) cigsale(1980) cigsale(1975) , trunit(`i')
trperiod(1989) xperiod(1980(1)1988) 是正常合成控制的指令