将百分比标签添加到堆叠条形图 [英] Add percentage labels to a stacked barplot
问题描述
我已经成功地在 R 中制作了一个堆叠条形图,其中几个不同类别的百分比加起来为 100%.我在这里做了一个示例数据框.
I have successfully made a stacked barplot in R where the percentages add up to 100% for several different categories. I made an example dataframe here.
example.Category<- c("Cat1","Cat2","Cat3","Cat4","Cat5","Cat6")
percent.good <- c(.25,.29,.45,.5,.8,.82)
example.data <- data.frame(example.Category,percent.good)
example.data$percent.bad <- (1-example.data$percent.good)
数据框看起来像这样.
example.Category percent.good percent.bad
1 Cat1 0.25 0.75
2 Cat2 0.29 0.71
3 Cat3 0.45 0.55
4 Cat4 0.50 0.50
5 Cat5 0.80 0.20
6 Cat6 0.82 0.18
然后我使用 reshape 包中的melt来得到这个......
I then used melt from the reshape package to get this...
example.melt <- melt(example.data, id.vars="example.Category")
example.Category variable value
1 Cat1 percent.good 0.25
2 Cat2 percent.good 0.29
3 Cat3 percent.good 0.45
4 Cat4 percent.good 0.50
5 Cat5 percent.good 0.80
6 Cat6 percent.good 0.82
7 Cat1 percent.bad 0.75
8 Cat2 percent.bad 0.71
9 Cat3 percent.bad 0.55
10 Cat4 percent.bad 0.50
11 Cat5 percent.bad 0.20
12 Cat6 percent.bad 0.18
然后我使用 ggplot 制作了一个显示这些百分比的堆叠条形图.
Then I used ggplot to make a stacked barplot displaying these percentages.
ggplot(example.melt, aes(x=example.Category, y=value, fill = variable)) +
geom_bar(position = "fill", stat = "identity",color='black',width=0.9) +
scale_y_continuous(labels = scales::percent) +
geom_text(aes(label = paste0((example.data$percent.good && example.data$percent.bad)*100), '%'),position = position_dodge(width = .9),size = 3)
这产生了这个图表,这是我想要的,除了它的标签方式.
This yields this graph, which is what I want, except for the way it labels.
我想要做的是在每个堆叠的条形上为每种颜色设置百分比标签,但我不知道该怎么做,并且确定我没有做对.我设法做的就是以某种方式创建另一个大约有 100 个的类别.我如何让百分比标签出现在此图表上,针对条形的每个部分?
What I want to do is have percentage labels for each color on each stacked bar, and I have no idea how to do that and am certain that I didn't do it right. All I managed to do was somehow create another category that has some '100's around. How would I get the percent labels to appear on this graph for each part of the bar?
我希望这不是多余的/以前问过的.谢谢.
I hope this isn't redundant/asked before. Thanks.
推荐答案
你可以这样做...
#set positions for labels
example.melt$labelpos <- ifelse(example.melt$variable=="percent.bad",
example.melt$value/2, 1 - example.melt$value/2)
ggplot(example.melt, aes(x=example.Category, y=value, fill = variable)) +
geom_bar(position = "fill", stat = "identity",color='black',width=0.9) +
scale_y_continuous(labels = scales::percent) +
#use positions to plot labels
geom_text(aes(label = paste0(100*value,"%"),y=labelpos),size = 3)
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