根据中位数对箱形图进行排序 [英] Sorting a boxplot based on median value

问题描述

我想使用R进行一系列箱形图，这些箱形图按中值排序。假设然后执行：

I'd like to use R to make a series of boxplots which are sorted by median value. Suppose then I execute:

boxplot(cost ~ type)

如果在y轴上显示了成本并且在x轴上显示了类型类别，这会给我一些盒形图：

This would give me some boxplots were cost is shown on the y axis and the type category is visible on the x-axis:

-----     -----
  |         |
 [ ]        |
  |        [ ]
  |         |
-----     -----
  A         B

我想要的是根据最高和最低中位数排序的箱线图。我的怀疑是，我需要做的是更改类型（A或B）的标签以数字方式指示哪个是最低和最高中值，但是我想知道是否有更聪明的方法来解决此问题。

However, what I'd like is the boxplot figures sorted from highest to lowest median value. My suspicion is that what I need to do is change the labels of the type (A or B) to numerically indicate which is the lowest and highest median value, but I wonder if there is a more clever way to solve the problem.

推荐答案

签出？reorder 。该示例似乎是您想要的，但以相反的顺序排序。我在下面的第一行中更改了-计数来按所需顺序进行排序。

Check out ?reorder. The example seems to be what you want, but sorted in the opposite order. I changed -count in the first line below to sort in the order you want.

  bymedian <- with(InsectSprays, reorder(spray, -count, median))
  boxplot(count ~ bymedian, data = InsectSprays,
          xlab = "Type of spray", ylab = "Insect count",
          main = "InsectSprays data", varwidth = TRUE,
          col = "lightgray")

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