use linshi0510,clear
bys stkcd year:gen bz=_n
local k=_N
local aa ""
local bb ""
local dd ""
gen bzz=""
format bzz %200s
forvalues i=1/`k'{
local aa=stkcd[`i']
local bb=year[`i']
if bz[`i']==1 & `i'!=1{
replace bzz="`dd'" if stkcd==stkcd[`i'-1] & year==year[`i'-1]
local dd ""
}
if bz[`i']>=1{
local dd="`dd'"+kamd[`i']
disp "`dd'"
disp length("`dd'")
}
}
replace bzz="`dd'" if stkcd==stkcd[`k'] & year==year[`k']
标签：kamd,dd,bzz,STKCD,STATA,year,stkcd,local From： https://www.cnblogs.com/xkdn/p/17387487.html