我也不会 呵呵

2# kid_niuben
set more off

cd c:\data

clear

input id stock_code date_number
1    2    17367
2    4    17535
3    4    18556
4    4    18626
5    6    17273
end
edit

gen date_lag = date_number[_n-1]
gen date_adv = date_number[_n+1]
gen date_dif = date_adv - date_lag
drop if date_dif > 25 & date_dif != .

g d=date_number-date_number[_n-1]
drop if d>25

4# sungmoo 没少麻烦您，谢谢你哈~~

3# houquan 非常感谢！