replace a=20.93426
总感觉你这么处理不妥当呢

https://bbs.pinggu.org/thread-5048204-1-1.html

*****模拟数据*********
clear
set obs 100
set seed 123456789
loca i "a b c d"
foreach j in `i'{
loca k= runiform()
gen `j'=`k'  if runiform()<0.1
}



****下面是否满足你的要求？*********
loca i "a b c d"
foreach j in `i'{
sort `j'
replace `j'=`j'[_n-1] if `j'==.
}

换个思路，把每一个变量替换成其平均值