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Day 12: Conditions and Operators — SAS vs R

IF-THEN-ELSE, SELECT-WHEN and operators vs case_when and filter

Practice SAS IF-THEN-ELSE, SELECT-WHEN, WHERE operators (IN, BETWEEN, LIKE, CONTAINS, =:) and FIRST./LAST. against R case_when, if_else, filter, %in% and row_number(), with a focus on the missing-value traps in ADSL, AE and ADVS.