| id | year | X |
| 1 | 1 | 4 |
| 1 | 1 | 4 |
Checking Duplications
I am trying to use xtset and I know how to remove any duplications. Is there a way to see if the non-id/time variables also repeat in value? For example, if I have
Could I see if X repeats along with those same observation id and year?
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