与ggplot并排的barplot [英] side-by-side barplot with ggplot

问题描述

我试图显示一个并排的条形图，比较两列之间每个字母等级的计数。 （A彼此相邻，B彼此相邻等）

 > dat = data.frame（grade1 = c（'A'，'A'，'A'，'B'，'B'，'C'），grade2 = c（'A'，'B'，'C' ，'C'，'D'，'D'））
> dat 
 grade1 grade2 
 1 A a 
 2 A b 
 3 A C 
 4 B C 
 5 B D 
 6 C D 
> ggplot（dat，aes（x = grade1，fill = grade2））+ 
 geom_bar（position = position_dodge（））
  

我试图得到一个类似于x轴（A，B，C，D）上的4个标签的结果。是否有一个特定的dplyr函数，我应该使用？

I'm trying to display a side-by-side bar plot that compares the counts of each a letter grade between the 2 columns. (A's next to each other, B's next to each other etc.)

> dat = data.frame(grade1 = c('A','A','A','B','B','C'), grade2 = c('A','B','C','C','D','D'))
> dat
  grade1 grade2
1      A      A
2      A      B
3      A      C
4      B      C
5      B      D
6      C      D
> ggplot(dat, aes(x=grade1, fill=grade2)) +
   geom_bar(position=position_dodge())

I'm trying to get a result that looks something like this with 4 labels on the x-axis (A, B, C, D). Is there a particular dplyr function I should be using?

https://i0.wp.com/martinsbioblogg.files.wordpress.com/2014/03/means-barplot.png

解决方案

You need to transform the data frame in a tidy form. For that you could use the tidyr package function gather. To ensure the correct sorting for the letter grade using an ordered factor is appropriate:

library(tidyr)
library(ggplot2)

dat <- data.frame(grade1 = c('A','A','A','B','B','C'), grade2 = c('A','B','C','C','D','D'))

tidy_dat <- gather(dat)
tidy_dat[,2] <- ordered(tidy_dat[,2], levels = c('A','B','C','D'))

ggplot(tidy_dat, aes(x= value, fill = key))+
   geom_bar(position = 'dodge')

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