ggplot2中的小提琴图的中位数和四分位数 [英] Median and quartile on violin plots in ggplot2

问题描述

我想用ggplot2绘制一些小提琴图，但我注意到中位数，第一和第三四分位数不会自动显示。我相信这些信息会对这些情节提供更多信息。有人知道一种方法吗？

I would like to draw some violin plots with ggplot2, but I noticed that median and first and third quartile are not automatically displayed. I believe these plots would be much more informative with this information. Does anybody know of a way to do it?

推荐答案

我从谷歌搜索中发现了这个：

I discovered this from a google search:

首先，这个堆栈溢出文章表示您可以添加 stat_summary（fun.y =median，geom =point）以绘制小提琴曲线上的中位数作为一个点。

First, this Stack Overflow post indicates that you can add stat_summary(fun.y="median", geom="point") to plot the median on a violin plot as a point.

关于四分位数，您可能必须为上面的fun.y参数编写自己的函数，如这里。例如：

With regard to quartiles, you will likely have to write your own function for the fun.y argument above, as demonstrated on here. E.g.:

median.quartile <- function(x){
    out <- quantile(x, probs = c(0.25,0.5,0.75))
    names(out) <- c("ymin","y","ymax")
    return(out) 
}

完整的代码可能如下所示：

The full code might look like this:

require(ggplot2)

median.quartile <- function(x){
  out <- quantile(x, probs = c(0.25,0.5,0.75))
  names(out) <- c("ymin","y","ymax")
  return(out) 
}

ggplot(iris,aes(Species,Sepal.Length))+
  geom_violin()+
  stat_summary(fun.y=median.quartile,geom='point')

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