获取与ggplot + stat_ecdf()相关的数据 [英] Get data associated to ggplot + stat_ecdf()

问题描述

我喜欢ggplot2软件包的 stat_ecdf()功能部分，该部分对于探索数据系列非常有用.但是，这只是视觉上的，我想知道获取关联表是否可行?如果可以，如何获取相关表?

I like the stat_ecdf() feature part of ggplot2 package, which I find quite useful to explore a data series. However this is only visual, and I wonder if it is feasible - and if yes how - to get the associated table?

请查看以下可重现的示例

Please have a look to the following reproducible example

p <- ggplot(iris, aes_string(x = "Sepal.Length")) + stat_ecdf() # building of the cumulated chart 
p
attributes(p) # chart attributes
p$data # data is iris dataset, not the serie used for displaying the chart

推荐答案

我们可以重新创建数据:

We can recreate the data:

#Recreate ecdf data
dat_ecdf <- 
  data.frame(x=unique(iris$Sepal.Length),
             y=ecdf(iris$Sepal.Length)(unique(iris$Sepal.Length))*length(iris$Sepal.Length))
#rescale y to 0,1 range
dat_ecdf$y <- 
  scale(dat_ecdf$y,center=min(dat_ecdf$y),scale=diff(range(dat_ecdf$y)))

以下2个图应该看起来相同:

Below 2 plots should look the same:

#plot using new data
ggplot(dat_ecdf,aes(x,y)) +
  geom_step() +
  xlim(4,8)

#plot with built-in stat_ecdf
ggplot(iris, aes_string(x = "Sepal.Length")) +
  stat_ecdf() +
  xlim(4,8)

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