在 ggplot 直方图中显示百分比

Question

我用百分比做了一个直方图（效果很好），但是当我尝试打印百分比值时，y 轴的刻度不再正确。

百分比直方图的代码（效果很好）如下：

data_impact_final %>%
  ggplot(aes(x = time_to_treat_month)) +
  geom_histogram(aes(y = (..count..)/sum(..count..)),binwidth=6) +
  scale_y_continuous(labels = scales::percent)

在此输入图像描述

但是，当我尝试使用 stat_bin 打印图表上的百分比时，y 轴的刻度不再正确。这是我用来打印百分比的代码：

data_impact_final %>%
  ggplot(aes(x = time_to_treat_month)) +
  geom_histogram(aes(y = (..count..)/sum(..count..)),binwidth=6) +
  stat_bin(binwidth=6, geom='text', color='white', aes(label = scales::percent((..count..)/sum(..count..))),position=position_stack(vjust = 0.5))+
  scale_y_continuous(labels = scales::percent)

在此输入图像描述

感谢您的帮助

Answer 1

问题是标签放置在y=..count..。为了解决您的问题，也y=..count../sum(..count..)使用stat_bin。

更新ggplot2 3.4.0自点点符号 ( )起，..count..已弃用，取而代之的是after_stat()。

使用ggplot2::mpg示例数据：

library(ggplot2)
library(dplyr)

mpg %>%
  ggplot(aes(x = hwy)) +
  geom_histogram(aes(y = after_stat(count / sum(count))),binwidth=6) +
  scale_y_continuous(labels = scales::percent)

ggplot(mpg, aes(x = hwy)) +
  geom_histogram(aes(y = after_stat(count / sum(count))), binwidth = 6) +
  stat_bin(
    binwidth = 6, geom = "text", color = "white",
    aes(y = after_stat(count / sum(count)), 
        label = scales::percent(after_stat(count / sum(count)))),
    position = position_stack(vjust = 0.5)
  ) +
  scale_y_continuous(labels = scales::percent)