ggplot2 - 做stat_summary产生..y ..？我将如何在y上子集？ [英] ggplot2 - does stat_summary produce ..y..? How would I subset on y?

问题描述

1. 好奇 - 为什么stat_summary不生成任何新变量？如果我使用stat_summary获得给定x的所有y的均值，那么有没有一些方法可以用来获得y值，或者我错过了什么？
找出所有新y的最大/最小值的新y（手段）？所以我们可以说我想要所有手段的点数，但是我想用不同颜色给最高平均点和最低平均点着色。我将如何做到这一点？正如布兰登所说，我强烈建议通过以下方式来总结数据： 你可以像这样访问汇总的y：



  d < -  data.frame（expand .grid（x = 1：4，rep = 1：3），y = rnorm（4 * 3））
 ggplot（d，aes（x，y））+ 
 stat_summary（mapping = aes （color = factor（ifelse（min（.. y ..）== .. y ..，1，ifelse（max（.. y ..）== .. y ..，3，2））
 $）），fun.y = mean，geom =point）
  

尽管理解。



1. Curious - why doesn't stat_summary produce any new variables? Would seems very useful to have access to the y values, or am I missing something?
2. If I used stat_summary to get the mean of all y's at a given x, is there some way to identify the new y (the means) that is the max/min of all new y's? So lets say I want points for all means, but then I want to color the highest mean point and the lowest mean point with different colors. How would I do that?

解决方案

As Brandon says, I strongly recommend to summarize data by yourself before using ggplot, but you can access the summarized "y" like this:

d <- data.frame(expand.grid(x=1:4, rep=1:3), y=rnorm(4*3))
ggplot(d, aes(x, y)) + 
  stat_summary(mapping=aes(colour=factor(ifelse(min(..y..)==..y.., 1, ifelse(max(..y..)==..y.., 3, 2))
)), fun.y=mean, geom="point")

maybe this is difficult to understand though.

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