【R】改变因子的排列顺序

 1
 2
 3
 4
 5
 6
 7
 8
 9
10

# 创建一个错误次序的因子 
sizes <- factor(c("small", "large", "large", "small", "medium")) 
sizes 
#> [1] small large large small medium 
#> Levels: large medium small
# 顺序被直接指定
sizes <- factor(sizes, levels = c("small", "medium", "large")) 
sizes 
#> [1] small  large  large  small  medium 
#> Levels: small medium large

1
2
3
4
5

sizes <- ordered(c("small", "large", "large", "small", "medium")) 
sizes <- ordered(sizes, levels = c("small", "medium", "large")) 
sizes 
#> [1] small large large small medium 
#> Levels: small < medium < large

1

sizes <- factor(sizes, levels=rev(levels(sizes)))