请先安装 ssc install egenmore 并试试

好像不行。我的意思是，比如ind1=11有stkcd 000002和000006和000007，那就是num=3，如果是ind1=3，有stkcd 000004和000008，那么num=2，以此类推

* Example generated by -dataex-. To install: ssc install dataex
clear
input str6 stkcd int acc byte ind1
"000002" 14975 11
"000002" 15340 11
"000002" 15705 11
"000002" 16070 11
"000002" 16436 11
"000002" 16801 11
"000002" 17166 11
"000002" 17531 11
"000002" 17897 11
"000002" 18262 11
"000002" 18627 11
"000002" 18992 11
"000002" 19358 11
"000002" 19723 11
"000002" 20088 11
"000002" 20453 11
"000002" 20819 11
"000003" 14975 19
"000003" 15340 19
"000004" 14975  3
"000004" 15340  3
"000004" 15705  3
"000004" 16070  3
"000004" 16436  3
"000004" 16801  3
"000004" 17166  3
"000004" 17531  3
"000004" 17897  3
"000004" 18262  3
"000004" 18627  3
"000004" 18992  3
"000004" 19358  3
"000004" 19723  3
"000004" 20088  3
"000004" 20453  3
"000004" 20819  3
"000005" 14975 14
"000005" 15340 14
"000005" 15705 14
"000005" 16070 14
"000005" 16436 14
"000005" 16801 14
"000005" 17166 14
"000005" 17531 14
"000005" 17897 14
"000005" 18262 14
"000005" 18627 14
"000005" 18992 14
"000005" 19358 14
"000005" 19723 14
"000005" 20088 14
"000005" 20453 14
"000005" 20819 14
"000006" 14975 11
"000006" 15340 11
"000006" 15705 11
"000006" 16070 11
"000006" 16436 11
"000006" 16801 11
"000006" 17166 11
"000006" 17531 11
"000006" 17897 11
"000006" 18262 11
"000006" 18627 11
"000006" 18992 11
"000006" 19358 11
"000006" 19723 11
"000006" 20088 11
"000006" 20453 11
"000006" 20819 11
"000007" 14975 11
"000007" 15340 11
"000007" 15705 11
"000007" 16070 11
"000007" 16436 11
"000007" 16801 11
"000007" 17166 11
"000007" 17531 11
"000007" 17897 11
"000007" 18262 11
"000007" 18627 11
"000007" 18992 11
"000007" 19358 11
"000007" 19723 11
"000007" 20088 11
"000007" 20453 11
"000007" 20819 11
"000008" 14975  3
"000008" 15340  3
"000008" 15705  3
"000008" 16070  3
"000008" 16436  3
"000008" 16801  3
"000008" 17166  3
"000008" 17531  3
"000008" 17897  3
"000008" 18262  3
"000008" 18627  3
"000008" 18992  3
"000008" 19358  3
end
format %tdnn/dd/CCYY acc
save "doc1.dta",replace

use "doc1.dta",clear
duplicates drop stkcd,force
bys ind1: gen num = _N
duplicates drop ind1,force
keep ind1 num
save "ind.dta",replace

use "doc1.dta",clear
merge m:1 ind1 using ind.dta,nogen
save "doc2.dta",replace
erase doc1.dta
erase ind.dta

奇怪，我的作法就是你要的答案啊？哪里错了？楼上做的答案与我的完全一样！

啊！是的！非常抱歉，是我太愚蠢了！！真的非常抱歉！！！您的做法是对的，而且很简单！点赞！！！