根据具有不同列的条件创建新列

Question

我想建议如何根据以下数据集编写新列：

df <- data.frame(AA = c("3454","345","5","345","567","79","43","2342","231","234","232","24"),
                 BB = c(123, 345, 7567, 234, 8679, 890, 812, 435345, 567, 568, 786, 678),
                 CC = c(1, 2, 6, 8, 22, 33, 56, 2, 34, 45, 45, 65), stringsAsFactors = F)

并且我想根据以下条件创建一个名为“ new”的新列：

1. Group1 = AA> 300＆BB> 2000＆CC <5

2. 第2组= AA≥20＆BB≤700＆CC> 60但≤70

谢谢！

Answer 1

case_when()中的

dplyr旨在避免使用嵌套的ifelse()。

library(dplyr)

df %>%
  mutate(new = case_when(
    AA > 300 & BB > 2000 & CC < 5 ~ "Group1",
    AA >= 20 & BB <= 700 & CC > 60 & CC <=70 ~ "Group2",
    TRUE ~ "other"
  ))

Answer 2

您可以尝试以下方法：

library(dplyr)
df %>% mutate(Group=ifelse(AA>300 & BB>2000 & CC<5,'Group1',
                       ifelse(AA>=20 & BB<=700 & (CC > 60 & CC<=70),'Group2',NA))) -> df1