how to solve multiple time ids issue in panel data analysis. I have multiple data for a given month which serves as a time id against the cross sectional id of location.
That's really a logic issue first - what do you want to do with the multiple ID?
1. Account for it in the model somehow
2. Aggregate the data to have a single obs per time
3. Pick one of the obs per time and use that one, ie first or last
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