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 |