我有以下代码。我想更改框图的颜色，使它们都具有相同的填充颜色(灰色)。 另外，我希望STAT_SUMMARY文本粘在每个条形图的底部，但似乎只提供相对位置？

谢谢

boxp <- ggplot(mtcars, aes(as.factor(cyl), wt, fill=as.factor(am)) ) +
  geom_bar(position = "dodge", stat = "summary", fun.y = "median") +
  geom_boxplot(outlier.shape = NA, width=0.2, color = "black", position = position_dodge(0.9)) +
  stat_summary(aes(label=round(..y..,2)), fun.y=median, geom="text", size=8, col = "white", vjust=8, position = position_dodge(0.9)) +
  stat_summary(fun.y=mean, geom="point", shape=18, size=4, col="white", position = position_dodge(0.9)) +
  labs(x = "Conditions", y = "Medians") +
  scale_y_continuous(limits=c(0,7),oob = rescale_none) +
  theme_bw()
boxp

推荐答案

以下是一种可能的解决方案，但它需要stage()函数的gggraph v3.3.0。

指出主要变化：

library(ggplot2)
library(scales)

ggplot(mtcars, aes(as.factor(cyl), wt,
                   group = interaction(as.factor(cyl), as.factor(am)))) +
  geom_bar(aes(fill=as.factor(am)), position = "dodge", stat = "summary", fun = "median") +
  geom_boxplot(outlier.shape = NA, width=0.2, 
               color = "black", fill = 'gray',
               position = position_dodge(0.9)) +
  stat_summary(aes(label=round(after_stat(y), 2), y = stage(wt, after_stat = 0)), 
               fun=median, geom="text", size=8, col = "white", vjust=-0.5,
               position = position_dodge(0.9)) +
  stat_summary(fun=mean, geom="point", shape=18, size=4, col="white", position = position_dodge(0.9)) +
  labs(x = "Conditions", y = "Medians") +
  scale_y_continuous(limits=c(0,7),oob = rescale_none) +
  theme_bw()

创建于2020-05-06reprex package(v0.3.0)