Creating new variable with maximum visit date by group_id

Wed, Aug 24, 2011 2:15 PM

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Kathleen Rollet Creating new variable with maximum visit date by group_id Aug 24 David Winsemius Creating new variable with maximum visit date by group_id Aug 24 Jean V Adams Creating new variable with maximum visit date by group_id Aug 24 Dennis Murphy Creating new variable with maximum visit date by group_id Aug 24