How can I get a random single value by ID number based on a column value? I have a data frame (large data) similar to the following
| ID | city |
|---|---|
| a | y |
| b | x |
| a | z |
| b | w |
Since I need to assign a unique city to each ID number, I would like to RANDOMLY choose between y and z for a and between x and w for b.
How can I do this?
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