r - R 中带有百分比和部分填充的桑基/冲积图

Question

我想使用 ggplot2 和 ggalluvial 修改现有的桑基图，使其更具吸引力

我的例子来自https://corybrunson.github.io/ggalluvial/articles/ggalluvial.html

library(ggplot2)
library(ggalluvial)

data(vaccinations)
levels(vaccinations$response) <- rev(levels(vaccinations$response))
ggplot(vaccinations,
       aes(x = survey, stratum = response, alluvium = subject,
           y = freq,
           fill = response, label = response)) +
  scale_x_discrete(expand = c(.1, .1)) +
  geom_flow() +
  geom_stratum(alpha = .5) +
  geom_text(stat = "stratum", size = 3) +
  theme(legend.position = "none") +
  ggtitle("vaccination survey responses at three points in time")

^{由 reprex package 创建于 2020-10-01 (v0.3.0)}

现在，我想更改此图，使其看起来类似于 https://sciolisticramblings.wordpress.com/2018/11/23/sankey-charts-the-new-pie-chart/ 中的图，即 1. 将绝对值更改为相对值(百分比) 2. 添加百分比标签和 3. 应用部分填充(例如“缺失”和“从不”)

我的方法:我想我可以将轴更改为百分比，例如:scale_y_continuous(label = scales::percent_format(scale = 100))但是，我不确定第 2 步和第 3 步。

Answer 1

这可以这样实现:

1. 更改为百分比可以通过向您的 df 添加一个新列来实现，其中包含调查的百分比份额，然后可以将其映射到 y 而不是 freq.

2. 要获得漂亮的百分比标签，您可以使用 scale_y_continuous(label = scales::percent_format())

3. 对于部分填充，您可以映射，例如response %in% c("Missing", "Never") 对 fill(这为“Missing”和“Never”提供 TRUE)并通过 scale_fill_manual

   设置填充颜色

4. 可以通过 label = paste0(..stratum.., "\n", scales::percent(..count.., accuracy = . 1)) 在 geom_text 中我使用变量 ..stratum.. 和 ..count.. 计算stat_stratum。

library(ggplot2)
library(ggalluvial)
library(dplyr)

data(vaccinations)
levels(vaccinations$response) <- rev(levels(vaccinations$response))

vaccinations <- vaccinations %>% 
  group_by(survey) %>% 
  mutate(pct = freq / sum(freq))

ggplot(vaccinations,
       aes(x = survey, stratum = response, alluvium = subject,
           y = pct,
           fill = response %in% c("Missing", "Never"), 
           label = response)) +
  scale_x_discrete(expand = c(.1, .1)) +
  scale_y_continuous(label = scales::percent_format()) +
  scale_fill_manual(values = c(`TRUE` = "cadetblue1", `FALSE` = "grey50")) +
  geom_flow() +
  geom_stratum(alpha = .5) +
  geom_text(aes(label = paste0(..stratum.., "\n", scales::percent(..count.., accuracy = .1))), stat = "stratum", size = 3) +
  theme(legend.position = "none") +
  ggtitle("vaccination survey responses at three points in time")