R语言之箱型图修改中位数为平均数

默认的箱型图如下所示：

但是有时，我需要将箱子中默认的中位数那条线，改为平均值。下面代码数据来源于上一篇博客：配对样本检验及绘图 - 简书 https://www.jianshu.com/p/e5a24590b5f6

> mean(dt_N)
[1] 6.370483
> median(dt_N)
[1] 6.389692
> mean(dt_T)
[1] 6.347574
> median(dt_T)
[1] 6.328644

我们可以发现在平均值这块，N组为6.37， T组为6.34， 而中位数这块，N组为6.38，T组为6.32。

• 箱型图中的横线为平均值：

library(dplyr)
library(ggplot2)
library(ggpubr)
theme_set(theme_pubclean())

plot <- ggplot(data = dt, aes(x = group, y = ERBB2)) +
  geom_boxplot(fatten = NULL,aes(colour = group )) +
  scale_color_manual(values=c("#137F5F", "#ED553B"))+
  aes(colour = group)+
  stat_summary(fun = mean, geom = "errorbar", aes(ymax = ..y.., ymin = ..y..),
               width = 0.75, size = 1, linetype = "solid")+
  geom_point(aes(colour = factor(group)), size=1, alpha=0.5) +
  geom_line(aes(group=num), colour="gray50", linetype="11") +
  theme_classic()

print(plot)

pdf(file = 'pair1.pdf', height = 4, width = 4)
print(plot)
dev.off()

• 箱型图中的横线为中位数：

library(dplyr)
library(ggplot2)
library(ggpubr)
theme_set(theme_pubclean())


plot <- ggplot(data = dt, aes(x = group, y = ERBB2)) +
  geom_boxplot(fatten = NULL,aes(colour = group )) +
  scale_color_manual(values=c("#137F5F", "#ED553B"))+
  aes(colour = group)+
  stat_summary(fun = median, geom = "errorbar", aes(ymax = ..y.., ymin = ..y..),
               width = 0.75, size = 1, linetype = "solid")+
  geom_point(aes(colour = factor(group)), size=1, alpha=0.5) +
  geom_line(aes(group=num), colour="gray50", linetype="11") +
  theme_classic()

print(plot)

pdf(file = 'pair2.pdf', height = 4, width = 4)
print(plot)
dev.off()