How would one go about doing this? I have a dataset where I rank the dates and I want a new column called First to always be the date that corresponds with the rank = 1 like the table below?
| DATE | RANK | FIRST |
| 10/31/1988 | 1 | 10/31/1988 |
| 10/31/1988 | 1 | 10/31/1988 |
| 10/31/1988 | 1 | 10/31/1988 |
| 11/30/1988 | 2 | 10/31/1988 |
| 11/30/1988 | 2 | 10/31/1988 |
| 11/30/1988 | 2 | 10/31/1988 |
| 12/31/1988 | 3 | 10/31/1988 |
| 12/31/1988 | 3 | 10/31/1988 |
| 12/31/1988 | 3 | 10/31/1988 |
| 1/31/1989 | 4 | 10/31/1988 |
| 1/31/1989 | 4 | 10/31/1988 |

