[编程问题求助] 怎么计算相同ID的个数 [推广有奖]

0关注
0粉丝

高中生

92%

还不是VIP/贵宾

威望: 0 级
论坛币: 7 个
通用积分: 0.0179
学术水平: 1 点
热心指数: 1 点
信用等级: 0 点
经验: 331 点
帖子: 23
精华: 0
在线时间: 41 小时
注册时间: 2018-5-17
最后登录: 2020-12-6

楼主

应云ll 发表于 2018-7-9 22:29:51 |只看作者 |坛友微信交流群|倒序 |AI写论文

是否 +2 论坛币

k人参与回答

经管之家送您一份

应届毕业生专属福利!

求职就业群

赵安豆老师微信：zhaoandou666

经管之家联合CDA

送您一个全额奖学金名额~ !

立即领取

感谢您参与论坛问题回答

经管之家送您两个论坛币！

+2 论坛币

怎么计算下列相同ID的个数，求教！例如“010104101002”一共有4个。求教命令！
* Example generated by -dataex-. To install: ssc install dataex
clear
input str12 ID
"010104101002"
"010104101002"
"010104101002"
"010104101002"
"010104102001"
"010104102001"
"010104102001"
"010104103002"
"010104103002"
"010104103002"
"010104104001"
"010104104001"
"010104105002"
"010104105002"
"010104105002"
"010104106001"
"010104106001"
"010104107002"
"010104107002"
"010104107002"
"010104108002"
"010104108002"
"010104109002"
"010104109002"
"010104110001"
"010104110001"
"010104110001"
"010104111001"
"010104111001"
"010104111001"
"010104111001"
"010104112001"
"010104112001"
"010104112001"
"010104113001"
"010104113001"
"010104113001"
"010104113001"
"010104113001"
"010104114001"
"010104114001"
"010104114001"
"010104115002"
"010104115002"
"010104116001"
"010104116001"
"010104117002"
"010104117002"
"010104117002"
"010104117002"
"010104117002"
"010104118001"
"010104118001"
"010104118001"
"010104118001"
"010104118001"
"010104118001"
"010104119001"
"010104119001"
"010104119001"
"010104120002"
"010104120002"
"010104120002"
"010104120002"
"010104121002"
"010104121002"
"010104121002"
"010104122002"
"010104122002"
"010104122002"
"010104122002"
"010104123001"
"010104123001"
"010104124002"
"010104124002"
"010104124002"
"010104124002"
"010104124002"
"010104125002"
"010104125002"
"010104127002"
"010104127002"
"010104127002"
"010104128002"
"010104128002"
"010104128002"
"010104129002"
"010104129002"
"010104129002"
"010104129002"
"010104130001"
"010104130001"
"010104130001"
"010104201002"
"010104201002"
"010104205002"
"010104205002"
"010104205002"
"010104205002"
"010104206002"
end
[/CODE]