| id | group | a | b | c |
| 1 | 1 | 1 | 0 | 1 |
| 2 | 1 | 0 | 1 | 1 |
| 3 | 1 | 1 | 0 | 1 |
| 4 | 2 | 1 | 0 | 0 |
| 5 | 2 | 1 | 0 | 0 |
| 6 | 3 | 0 | 1 | 1 |
| 7 | 3 | 1 | 0 | 1 |
How do I create a variable "c" which takes a value of one only when the "group" includes both a=1 and b=1?
"a" and "b" are binary variables that are mutually exclusive.
Nobuya Fukugawa
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