คำถามติดแท็ก duplicates

ฉันมีกรอบข้อมูลติดตั้งดังนี้: df <- data.frame("id" = c(111,111,111,222,222,222,222,333,333,333,333), "Location" = c("A","B","A","A","C","B","A","B","A","A","A"), "Encounter" = c(1,2,3,1,2,3,4,1,2,3,4)) id Location Encounter 1 111 A 1 2 111 B 2 3 111 A 3 4 222 A 1 5 222 C 2 6 222 B 3 7 222 A 4 8 333 B 1 9 333 A …

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