ggplot2：stat_summary与geom_boxplot的水平位置 [英] ggplot2: horizontal position of stat_summary with geom_boxplot

问题描述

我想使用 ggplot2 注释每个箱线图的均值。但是，我无法弄清楚如何将标记均值的符号在各自的框内水平居中（见下图）。

I want to annotate mean of each boxplot using ggplot2. However, I could not figure out how to horizontally center the symbols marking the means within their respective boxes (see image below).

以下是MWE供参考：

library(ggplot2)
ggplot(data=mpg, mapping=aes(x=class, y=hwy)) + 
  geom_boxplot(aes(color = drv), outlier.shape = NA) +
  stat_summary(fun.y = mean, geom = "point", size=2, aes(shape = drv, color = drv)) + 
  theme_bw()

推荐答案

尝试使用 position_dodge（）

ggplot(data=mpg, mapping=aes(x=class, y=hwy)) + 
       geom_boxplot(aes(color = drv), outlier.shape = NA) +
       stat_summary(fun.y = mean, geom = "point", size=2, aes(shape = drv, color = drv), 
                    position = position_dodge(width = .75)) + 
       theme_bw()

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