Hi all, I have data in the form ID drug_id date_start date_end a 1 1/1/01 a 2 1/1/01 a 3 1/1/01 1/1/02 a 4 1/1/02 b ... I am trying to convert it to something like ID regimen1 date_start_regimen1 data_stop_regimen1 regimen2 date_start_regimen2 date_stop_regimen2 a 123 1/1/01 1/1/02 124 1/1/02 b ... Any suggestions?? I'm scratching my head, thank you!
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