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tempname resmat
forvalues i = 1/21 {
synth value density value(2004) value(2000) value(1996) , trunit(`i') trperiod(2005) xperiod(1996(1)2004)
matrix `resmat' = nullmat(`resmat') \ e(RMSPE)
local names `"`names' `"`i'"'"'
}
mat colnames `resmat' = "RMSPE"
mat rownames `resmat' = `names'
matlist `resmat' , row("Treated Unit")


use smoking, clear

** ask stata i am panel data

tsset y year

** loop through units
forval i=1/69{

qui synth value density value(2004) value(2000) value(1996), ///
xperiod(1996(1)2004) trunit(`i') trperiod(2005) keep(synth_`i', replace)
}
*
forval i=1/69{

use synth_`i', clear

rename _time years

gen tr_effect_`i' = _Y_treated - _Y_synthetic

keep years tr_effect_`i'

drop if missing(years)

save synth_`i', replace
}
****
use synth_1, clear

forval i=2/69{

qui merge 1:1 years using synth_`i', nogenerate
}
***
local lp

forval i=1/69 {
   local lp `lp' line tr_effect_`i' years, lcolor(gs12) ||
}
*

* create plot

twoway `lp' || line tr_effect_1 years, ///
lcolor(orange) legend(off) xline(2005, lpattern(dash))

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关键词：panel data Synthetic forvalues generate forvalue

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