箱线图显示平均值 [英] Boxplot show the value of mean

问题描述

在这个箱线图中，我们可以看到均值，但我们如何才能在图中获得每个箱线图的每个均值的数值?

In this boxplot we can see the mean but how can we have also the number value on the plot for every mean of every box plot?

 ggplot(data=PlantGrowth, aes(x=group, y=weight, fill=group)) + geom_boxplot() +
     stat_summary(fun.y=mean, colour="darkred", geom="point", 
                           shape=18, size=3,show_guide = FALSE)

推荐答案

首先，你可以用aggregate来计算组均值:

First, you can calculate the group means with aggregate:

means <- aggregate(weight ~  group, PlantGrowth, mean)

这个数据集可以与geom_text一起使用:

This dataset can be used with geom_text:

library(ggplot2)
ggplot(data=PlantGrowth, aes(x=group, y=weight, fill=group)) + geom_boxplot() +
  stat_summary(fun=mean, colour="darkred", geom="point", 
               shape=18, size=3, show.legend=FALSE) + 
  geom_text(data = means, aes(label = weight, y = weight + 0.08))

这里，+ 0.08 用于将标签放置在表示均值的点上方.

Here, + 0.08 is used to place the label above the point representing the mean.

没有ggplot2的替代版本:

means <- aggregate(weight ~  group, PlantGrowth, mean)

boxplot(weight ~ group, PlantGrowth)
points(1:3, means$weight, col = "red")
text(1:3, means$weight + 0.08, labels = means$weight)

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