在ggplot boxplot中重新定位stat_summary计数

Question

df2<-data.frame(id=c("a","f","f","b","b","c","c","c","d","d","",""),
                var=c(12,20,15,18,10,30,5,8,5,5,3,5))

give.n <- function(x){
  return(c(y = mean(x), label = length(x)))
}
ggplot(data=subset(df2, id != ""), aes(x = reorder(id, -var), y = var)) +
  geom_boxplot()+
  stat_summary(fun.data = give.n, geom = "text", 
               position = position_jitter(height=1, width = 0))+
  theme(axis.text.x = element_text(angle = 90, hjust = 1, size=11, vjust = -.005))+
  ggtitle("Title")+
  xlab("")+
  ylab("value")

我有上面的情节，但是我想把计数放在箱线图中的中线以上，这样它们就更明显了。以这种方式使用position_jitter并不总是阻止计数与中间条重叠。有什么建议？ *编辑提供df2

Answer 1

您需要在返回的y =值中定义调整。例如，让它返回中位数+ 0.1。您必须手动调整0.1数据。

give.n <- function(x){
  return(c(y = median(x) + 0.1, label = length(x)))
}

ggplot(iris, aes(Species, Sepal.Width)) + 
  geom_boxplot() +
  stat_summary(fun.data = give.n, geom = "text")

或者，如果您希望它在中间和上铰链之间准确居中，您可以像这样计算该位置：

give.n <- function(x){
  return(c(y = mean(fivenum(x)[3:4]), label = length(x)))
}