对一组数据进行分类的操作方法 cut

editor

对于一组连续变量数据，进行分类，如何操作呢。方法很多种，现介绍一种比较简单的方法。
例子如下。
mydata<-1:20

myresult<-cut(mydata, c(0,5,15,20))
myresult


[1] (0,5]   (0,5]   (0,5]   (0,5]   (0,5]   (5,15]  (5,15]  (5,15]  (5,15]  (5,15]  (5,15]  (5,15]  (5,15]  (5,15]
[15] (5,15]  (15,20] (15,20] (15,20] (15,20] (15,20]
Levels: (0,5] (5,15] (15,20]


mydata<-1:20
########################分类后标上标签
myresult<-cut(mydata, c(0,5,15,20), labels = c("Young", "Middle-aged","Senior"))
myresult


[1] Young       Young       Young       Young       Young       Middle-aged Middle-aged Middle-aged Middle-aged
[10] Middle-aged Middle-aged Middle-aged Middle-aged Middle-aged Middle-aged Senior      Senior      Senior     
[19] Senior      Senior     
Levels: Young Middle-aged Senior


myresult<-ordered(cut(mydata, c(0,5,15,20), labels = c("Young", "Middle-aged","Senior")))
myresult

[1] Young       Young       Young       Young       Young       Middle-aged Middle-aged Middle-aged Middle-aged
[10] Middle-aged Middle-aged Middle-aged Middle-aged Middle-aged Middle-aged Senior      Senior      Senior     
[19] Senior      Senior     
Levels: Young < Middle-aged < Senior


仅供参考 大家各抒己见

Master

总结很好，感谢了