堆叠条形图，带有百分比值的标签条 [英] Stacked bar plot, label bars with percentage values

问题描述

我想将表格绘制为堆积的条形图，并用百分比标记条形.这是一个示例:

I want to plot a table as a stacked bar plot and label the bars with the percentages. Here is an example:

data <- matrix(c(34, 66, 22, 78), ncol = 2)
data <- as.table(data)
colnames(data) <- c("shop1", "shop2")
rownames(data) <- c("prod1", "prod2")

library(reshape2)
data_m <- melt(data, varnames = c("Product", "Shop"), id.vars = "Product")

library(scales)
library(ggplot2)
ggplot(data_m, aes(x = Shop, y = value, fill = Product)) + 
geom_bar(position = "fill", stat = "identity") + 
scale_y_continuous(labels = percent_format()) +
labs(x = "", y = "")

我尝试添加标签

geom_text(data = data_m, aes(x = Shop, y = value, 
                         label = paste0((value/100) * 100,"%")), size=4)

但这会导致

有了JanLauGe的回答，我得到了

With JanLauGe's answer I get

现在，错误地分配了百分比.

Now, the percentages are wrongly assigned.

另一句话:如果表的列总和不同，该如何处理，比如说91和107，而不是我上面的示例中假定的100，该怎么办?

Another remark: what to do if the column sums of the table were not the same, say 91 and 107 instead of 100 as assumed in my above example?

推荐答案

尝试尝试

geom_text(data = data_m, 
          aes(x = Shop, 
              y = value / max(value), 
              label = paste0(value/100,"%")), 
          size = 4)

问题:标签位置相对于绘图区域(0到1，1 = max(value)).

The problem: label position is relative to the plot area (0 to 1, 1 = max(value)).

解决方案:相应地重新调整值.

The solution: rescale value accordingly.

编辑:此帖子的副本.

您正在寻找的是这个

ggplot(data = data_m, 
       aes(x = Shop, 
           y = value, 
           fill = Product,
           cumulative = TRUE)) +
  geom_col() +
  geom_text(aes(label = paste0(value/100,"%")), 
            position = position_stack(vjust = 0.5)) + 
  theme_minimal()

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