如何在R中创建分组的箱线图? [英] How to create a grouped boxplot in R?

问题描述

我想合并分组的三个数据集，并获得仅包含两个框的图形，其中1个用于A，1个用于B.您能建议如何获得它吗?

I want to merge the three datasets grouped and obtain a graph with only two boxes, 1 for A and 1 for B. Can you suggest how to get that?

我正在尝试在R中创建一个分组的箱线图.我分为2组:A和B，每组中有3个子组，每个子组有5个测量值.

I'm tryng to create a grouped boxplot in R. I have 2 groups: A and B, in each group I have 3 subgroups with 5 measurements each.

以下是我构造箱线图的方法，但是如果有人可以做得更好，更短或更简单，我将不胜感激

The following is the way that I constructed the boxplot, but if someone has a better, shorter or easy way to do, I'll appreciate

A1 <- c(1,2,9,6,4)
A2 <- c(5,1,9,2,3)
A3 <- c(1,2,3,4,5)
B1 <- c(2,4,6,8,10)
B2 <- c(0,3,6,9,12)
B3 <- c(1,1,2,8,7)

DF <- data.frame(A1, A2, A3, B1, B2, B3)

boxplot(DF, col = rainbow(3, s = 0.5))
axis(side = 1, at = c(2,5), labels = c("A","B"))
legend("topleft", fill = rainbow(3, s = 0.5), legend = c(1,2,3), horiz = T)

如何正确地将A和B中的框正确分组(合并)，并按照尝试将轴标题固定为简单的A和B?

How can I group correctly (joint) the boxes in A and B, and fix the axis title to simple A and B as I tryed?

我想要类似的东西

推荐答案

当数据采用 long 格式(反之为 wide )时，将这样的分组更加容易.从向量开始:

It's easier to group them like this when data is in a long format vice wide. Starting with your vectors:

DF2 <- data.frame(
  x = c(c(A1, A2, A3), c(B1, B2, B3)),
  y = rep(c("A", "B"), each = 15),
  z = rep(rep(1:3, each=5), 2),
  stringsAsFactors = FALSE
)
str(DF2)
# 'data.frame': 30 obs. of  3 variables:
#  $ x: num  1 2 9 6 4 5 1 9 2 3 ...
#  $ y: chr  "A" "A" "A" "A" ...
#  $ z: int  1 1 1 1 1 2 2 2 2 2 ...

cols <- rainbow(3, s = 0.5)
boxplot(x ~ z + y, data = DF2,
        at = c(1:3, 5:7), col = cols,
        names = c("", "A", "", "", "B", ""), xaxs = FALSE)
legend("topleft", fill = cols, legend = c(1,2,3), horiz = T)

使用at手动控制位置，因此视觉分组"不是很可靠. (您可以使用width和/或boxwex控制它们之间的间距.)

The use of at manually controls the placement, so the "visual grouping" is not very robust. (You can control the spacing between them with width and/or boxwex.)

您也可以选择ggplot2:

library(ggplot2)
ggplot(DF2, aes(y, x, fill=factor(z))) +
  geom_boxplot()

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