r - ggplot2：使用填充geom_bar指定颜色时缺少图例

Question

在堆积条形图中，我试图指定不同条形的颜色。例如，治疗组的渐变绿色和对照组的渐变蓝色。但是，在指定颜色后，我丢失了图例。有没有办法把传说加回来？

# Create data set
ID<-c(rep(1:4, 6))
Group<-c(rep(0,4), rep(1,4), rep(0,4), rep(1,4), rep(0,4), rep(1,4))
Time<-c(rep("Time 1",8), rep("Time 2",8), rep("Time 3",8))
Response<-c(1,2,3,1,2,3,1,2,2,3,3,1,1,3,2,1,2,1,3,1,2,2,1,3)

data <- data.frame(ID, Group, Time, Response)
data$Response<-as.factor(data$Response)

library(dplyr)
data1<-as.data.frame(
  data %>% 
    group_by(Group, Time, Response) %>%                     
    summarise(N= n()))

# Define the color for control and treatment groups
trtCol <- c("#3182bd", "#9ecae1", "#deebf7")
conCol <- c("#31a354", "#a1d99b", "#e5f5e0")
Palette<-c(conCol, trtCol, conCol, trtCol, conCol, trtCol)

library(ggplot2)
library(scales)

# Specify color in ggplot using "geom_bar (fill=Palette)"
ggplot(data1, aes(Group, N, fill = Response))+ 
  geom_bar(position = "fill",stat = "identity", fill=Palette) + 
  facet_wrap(~Time, strip.position = "bottom") +
  labs(title="Distribution of Responses by Groups over Time", 
       x="Time Points", y="Percentage")+
  scale_y_continuous(labels = percent_format()) +
  theme_classic() +
  theme(plot.title = element_text(hjust = 0.5), 
        axis.text.x=element_blank(), axis.ticks.x=element_blank(), 
        panel.spacing = unit(0.1, "lines"))+
  geom_text(aes(x=0,y=-0.05,label="Control\nGroup"), size=3.5)+
  geom_text(aes(x=1,y=-0.05,label="Treatment\nGroup"), size=3.5)

当我为每个条形指定颜色时，图例消失了。

我想要的图表如上所示。有谁知道如何找回传说？治疗组一份，对照组一份。或者有没有办法手动添加图例？

标签： rcolorsbar-chartlegendgeom-bar

Answer 1

我不是这方面的专家，但我认为您丢失了图例，因为您在参数分配ggplot2中删除了您的审美映射。从本质上讲，你的审美不仅仅是，而是 和 的组合，因为每个组对于相同的响应都有不同的颜色（这可能是一个有问题的做法，但这不是我能决定的）。geom_barfill=PalettefillResponseResponseGroup

我认为这段代码给了你你想要的。我添加了一个helper字段以data1具有适当的fill美感。注意我需要手动覆盖图例标签scale_fill_manual

library(dplyr)
data1<- as.data.frame(data %>% 
    group_by(Group, Time, Response) %>%                     
    summarise(N= n())) %>%
  mutate(helper = as.character(group_indices(., Group, Response)))

# Define the color for control and treatment groups
trtCol <- c("#deebf7", "#9ecae1","#3182bd")
conCol <- c("#e5f5e0", "#a1d99b", "#31a354")
Palette<-c(conCol, trtCol, conCol, trtCol, conCol, trtCol)

library(ggplot2)
library(scales)

# Specify color in ggplot using "geom_bar (fill=Palette)"
ggplot(data1, aes(Group, N, fill = helper)) + 
  facet_wrap(~Time, strip.position = "bottom") +
  labs(title="Distribution of Responses by Groups over Time", x="Time Points", y="Percentage") +
  scale_fill_manual(name = "Response", values = Palette, labels = c(1, 2, 3, 1, 2, 3)) +
  geom_bar(position = "fill",stat = "identity") + 
  scale_y_continuous(labels = percent_format()) + 
  theme_classic() +
  theme(plot.title = element_text(hjust = 0.5), axis.text.x=element_blank(), axis.ticks.x=element_blank(), 
        panel.spacing = unit(0.1, "lines"))+
  geom_text(aes(x=0,y=-0.05,label="Control\nGroup"), size=3.5)+
  geom_text(aes(x=1,y=-0.05,label="Treatment\nGroup"), size=3.5)