字符串变量分组求和

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* Example generated by -dataex-. To install: ssc install dataex
clear
input int(id year) str1 gen
1 2019 "a"
1 2019 "a"
1 2019 "a"
1 2020 "a"
1 2020 "b"
1 2020 "a"
1 2021 "a"
1 2021 "b"
1 2021 "b"
2 2019 "a"
2 2019 "a"
2 2020 "b"
2 2020 "b"
2 2021 "c"
2 2021 "c"
3 2019 "a"
3 2019 "a"
3 2019 "a"
3 2019 "a"
3 2020 "a"
3 2020 "a"
3 2020 "a"
3 2020 "a"
3 2021 "b"
3 2021 "a"
3 2021 "c"
3 2021 "a"
end
[/CODE]
我想按照id和year分组，生成新变量gensum为分组后对gen的加总，想要的结果如下。有没有不使用分组循环的方法？
id year gen gensum
1 2019 "a" "aaa"
1 2019 "a" "aaa"
1 2019 "a" "aaa"
1 2020 "a" "aba"
1 2020 "b" "aba"
1 2020 "a" "aba"
1 2021 "a" "abb"
1 2021 "b" "abb"
1 2021 "b" "abb"
2 2019 "a" "aa"
2 2019 "a" "aa"
2 2020 "b" "bb"
2 2020 "b" "bb"
2 2021 "c" "cc"
2 2021 "c" "cc"
3 2019 "a" "aaaa"
3 2019 "a" "aaaa"
3 2019 "a" "aaaa"
3 2019 "a" "aaaa"
3 2020 "a" "aaaa"
3 2020 "a" "aaaa"
3 2020 "a" "aaaa"
3 2020 "a" "aaaa"
3 2021 "b" "baca"
3 2021 "a" "baca"
3 2021 "c" "baca"
3 2021 "a" "baca"

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关键词：字符串变量 变量分组 字符串 generated generate

gen gensum=""
bys id year:replace gensum=gen[1]+gen[2]+gen[3]+gen[4]

qianchen 发表于 2024-7-24 21:07
gen gensum=""
bys id year:replace gensum=gen[1]+gen[2]+gen[3]+gen[4]

谢谢。我试了一下，是可以的。如果不知道id year每组最多4条记录的话，只能把写大一点吗？

sysi11 发表于 2024-7-26 09:27
谢谢。我试了一下，是可以的。如果不知道id year每组最多4条记录的话，只能把写大一点吗？

完全可以的