说错了，是非平衡面板，不是非面板

应该是做错了

global xlist " 协变量 "
forvalues i = 2014/2023{
preserve
cap keep if year == `i'
cap set seed 0001
cap gen tmp = runiform()
cap sort tmp
cap psmatch2 Treat $xlist, out(y) logit ate neighbor(1) common caliper(.05)  ties
cap save `i'.dta,replace
restore
}
use 2023.dta,clear
forvalues i = 2014/2023{
cap append using `i'.dta
}

global xlist " Size Lev Cashflow Growth Indep Dual Top1 TobinQ ListAge Cap1  "
forvalues i = 2014/2023{
preserve
cap keep if year == `i'
cap set seed 0001
cap gen tmp = runiform()
cap sort tmp
cap psmatch2 Treat $xlist, out(EP1) logit neighbor(1) common caliper(.05) noreplace ties
cap save `i'.dta,replace
restore
}
use 2023.dta,clear
forvalues i = 2014/2023{
cap append using `i'.dta
}
那您可以帮我看看是不是代码错了吗？

你检查一下每一年 匹配后的结果 和原始数据中每一年的观测值差异