Pearly Spencer
2020-01-31 19:56
以下对我有用：
clear
input group choice
1 0
1 1
1 0
2 0
2 0
2 1
3 1
3 0
3 0
5 0
5 1
5 0
end
bysort group: generate coding = _n
label define coding 1 "train" 2 "car" 3 "bus"
label values coding coding
bysort group: generate tag = coding if choice == 1
egen need = max(tag), by(group)
label values need coding
drop tag
结果：
list, sepby(group)
+---------------------------------+
| group choice coding need |
|---------------------------------|
1. | 1 0 train car |
2. | 1 1 car car |
3. | 1 0 bus car |
|---------------------------------|
4. | 2 0 train bus |
5. | 2 0 car bus |
6. | 2 1 bus bus |
|---------------------------------|
7. | 3 1 train train |
8. | 3 0 car train |
9. | 3 0 bus train |
|---------------------------------|
10. | 5 0 train car |
11. | 5 1 car car |
12. | 5 0 bus car |
+---------------------------------+
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