forvalues i=1(1)200{ use id,clear sample 1 //随机选1%个样本 keep id save temp,replace use placebo,clear merge m:1 id using temp cap drop trea gen treat =(_merge==3) drop _merge save placebo_did,replace reghdfe aqiind c.treat#c.post htmpt ltmpt , $absorb $cluster parmest,format (estimate min95 max95 %8.2f p %8.3f) saving('temp1.dta', replace) use 'temp1.dta', clear keep if parm=='c.treat#c.post' append using 'simulations.dta' save 'simulations.dta', replace }