避免在ggplot2中使用geom_point进行图覆盖 [英] Avoid plot overlay using geom_point in ggplot2

问题描述

在ggplot2中，geom_point默认为在当前绘图上进行绘图。例如，在调用geom_boxplot之后调用geom_point会导致在箱图上绘制点：

In ggplot2, geom_point defaults to plotting over the current plot. For example, calling geom_point after a call to geom_boxplot results in the points plotted over the boxplot:

ggplot(iris, aes(x = "All", y = Sepal.Length)) +
  geom_boxplot() +
  geom_point(aes(color=Species), position = "jitter") 

有没有办法是将点单独绘制到侧面，而不是在箱线图上绘制？

Is there a way to plot the points separately to the side, rather than over the boxplot?

在我的特殊情况下，我想这样做是因为这些点使图变模糊（即使透明，等等），这个问题与示例数据集无关。

In my particular case I want to do this because the points obscure the plot (even with transparency, etc), a problem that is not an issue with the example dataset here.

推荐答案

您可以通过提供单独的x来分别绘制它们-箱线图和点的值：

You can plot them separately by supplying separate x-values for the boxplot and the points:

ggplot(iris, aes(y = Sepal.Length)) +
  geom_boxplot(aes(x="Boxplot")) +
  geom_point(aes(x="Points", color=Species), 
             position = position_jitter(width=0.15, height=0)) 

另一种选择是按物种使用箱线图。

Another option is to use boxplots by species:

ggplot(iris, aes(y = Sepal.Length)) +
  geom_boxplot(aes(x="All Data"), width=0.5) +
  geom_boxplot(aes(x="By Species", colour=Species), width=0.5,
               position=position_dodge(width=0.6)) 

这是两个图看起来像：

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