Hi, How can I fill in the cohort number for the same record ID but at different time points? Please see What the dataset looks like: Record ID Timepoint Cohort # 1 scr 1 1 bl . 1 w8 . 1 m6 . 1 m12 . 2 scr 1 2 bl . 2 w8 . 3 scr 2 3 bl . 3 w8 . What I want: Record ID Timepoint Cohort # 1 scr 1 1 bl 1 1 w8 1 1 m6 1 1 m12 1 2 scr 1 2 bl 1 2 w8 1 3 scr 2 3 bl 2 3 w8 2 Thank you!
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