尝试在R中使用多个if else语句创建新列

# 创建一个示例数据框
df <- data.frame(score = c(85, 92, 78, 65, 95, 73))

# 使用ifelse创建新列
df$grade <- ifelse(df$score >= 90, "A",
                   ifelse(df$score >= 80, "B",
                          ifelse(df$score >= 70, "C",
                                 ifelse(df$score >= 60, "D", "F"))))

# 打印结果
print(df)

# 加载dplyr包
library(dplyr)

# 使用case_when创建新列
df <- df %>%
  mutate(grade = case_when(
    score >= 90 ~ "A",
    score >= 80 ~ "B",
    score >= 70 ~ "C",
    score >= 60 ~ "D",
    TRUE ~ "F"
  ))

# 打印结果
print(df)