R中的相对频率直方图，ggplot [英] Relative frequency histogram in R, ggplot

问题描述

我可以使用 lattice 包在R中绘制相对频率直方图:

I can draw relative frequency histogram in R, using lattice package:

a <- runif(100)
library(lattice)
histogram(a)

我想在 ggplot 中获得相同的图形.我尝试过

I want to get the same graph in ggplot. I tried

dt <- data.frame(a)
ggplot(dt, aes(x = a)) + 
geom_bar(aes(y = ..prop..))+
 scale_y_continuous(labels=percent)

但是它不能那样工作.我应该在代码中更改什么?对我来说，在图形之前计算相对频率不是一个选择.

but it doesn't work like that. What I should change in the code? Calculating relative frequency before graph is not an option for me.

推荐答案

您想要的是直方图，而不是条形图，所以:

You want a histogram, not a barplot, so:

ggplot(dt, aes(x = a)) + 
  geom_histogram(aes(y = stat(count) / sum(count)), bins = 8) +
  scale_y_continuous(labels = scales::percent)

晶格:

ggplot2 :

您会看到，两种算法的分箱算法工作稍有不同.

You can see that the binning algorithm works slightly different for the two packages.

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