本文介绍了ggplot2:带正态曲线的直方图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我一直在尝试使用 ggplot 2 在我的直方图上叠加一条正态曲线.
I've been trying to superimpose a normal curve over my histogram with ggplot 2.
我的公式:
data <- read.csv (path...)
ggplot(data, aes(V2)) +
geom_histogram(alpha=0.3, fill='white', colour='black', binwidth=.04)
我尝试了几件事:
+ stat_function(fun=dnorm)
....没有改变任何东西
....didn't change anything
+ stat_density(geom = "line", colour = "red")
...在 x 轴上给了我一条直线红线.
...gave me a straight red line on the x-axis.
+ geom_density()
对我不起作用，因为我想将频率值保留在 y 轴上，并且不需要密度值.
doesn't work for me because I want to keep my frequency values on the y-axis, and want no density values.
有什么建议吗?
预先感谢您提供任何提示！
Thanks in advance for any tips!
找到解决方案！
+geom_density(aes(y=0.045*..count..), colour="black", adjust=4)
推荐答案
我想我明白了:
set.seed(1)
df <- data.frame(PF = 10*rnorm(1000))
ggplot(df, aes(x = PF)) +
geom_histogram(aes(y =..density..),
breaks = seq(-50, 50, by = 10),
colour = "black",
fill = "white") +
stat_function(fun = dnorm, args = list(mean = mean(df$PF), sd = sd(df$PF)))
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