缩尾命令最常用的是连玉君老师编写的winsor2，用以将离群值缩尾。
sysuse nlsw88, clear
sum wage, detail
winsor2 wage, replace cuts(1 99)
/*约等于
replace wage=1.930993 if wage<1.930993
replace wage=38.70926 if wage>38.70926
*/
winsor2 wage, replace cuts(1 99) trim
/*
replace wage=. if wage<1.930993
replace wage=. if wage>38.70926
*/
