在R中将连续范围更改为分类 [英] Changing Continuous Ranges to Categorical in R

问题描述

我试图将一些连续的整数转换为分类范围，但是发生了一些我不了解的事情。尽管我一心想要得到想要的东西，但我仍然不明白为什么会这样。

I was trying to convert some continuous integers to categorical ranges, but something I did not understand happened. Although I fixed to get what I want, I still don't understand why it happened.

变量是0到12之间的一些整数，下面的代码还剩下 10 ， 5 + 类别中的11 ， 12 。

The variable is some integers from 0 to 12, the following code left 10,11,12 out from the 5+ category.

py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==0]<-"0"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==1]<-"1"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==2]<-"2"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==3]<-"3"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==4]<-"4"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain>=5]<-"5+"
py2$Daily.Whole.Grain<-as.factor(py2$Daily.Whole.Grain)

但是当我更改转换顺序时，它包括 10 ， 11 ， 12 。

But when I change the order of conversion, it includes 10,11,12.

py2$Daily.Whole.Grain[py2$Daily.Whole.Grain>=5]<-"5+"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==0]<-"0"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==1]<-"1"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==2]<-"2"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==3]<-"3"
py2$Daily.Whole.Grain[py2$Daily.Whole.Grain==4]<-"4"

任何人都可以解释一下，为什么将两位数整数留在外面？
非常感谢。

Can anyone explain it, why it leaves double digits integers out? Thanks very much.

推荐答案

如@CathG所述，问题是由于将列从数字归类为字符。这也许是使用cut函数的更好解决方案，它将基于变量的割点为您提供因子：

As @CathG mentioned, the problem is due to converting the column from a numeric class to character. Here is perhaps a better solution using the cut function which will give you factors based on cut-points of a variable:

py2 <- data.frame(Daily.Whole.Grain = 1:10)
py2$Daily.Whole.Grain1 <- cut(py2$Daily.Whole.Grain, 
    breaks = c(1:5, Inf), right = FALSE, labels = c(1:4, "5+"))
py2
   Daily.Whole.Grain Daily.Whole.Grain1
1                  1                  1
2                  2                  2
3                  3                  3
4                  4                  4
5                  5                 5+
6                  6                 5+
7                  7                 5+
8                  8                 5+
9                  9                 5+
10                10                 5+

这篇关于在R中将连续范围更改为分类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！