我正在使用usmap :: plot_usmap()绘制一组“处理”县,这样对于已标识的县,处理= 1,否则为0。我希望图例反映出变量是离散的(0/1)而不是显示连续的颜色比例这一事实吗?我的数据集有2个变量:“陷阱”和“治疗”。
我的代码是:
library(usmap)
library(ggplot2)
plot_usmap(regions = "county", data=data, values = "treatment",color="grey")+
theme(panel.background = element_rect(colour = "black"))+
scale_fill_gradient(low = "white", high = "blue",name = "treatment",
breaks=c(0,1), limits = c(0, 1)) +
theme(legend.position = "right")
您必须将处理转换为factor
或character
。然后可以通过scale_fill_manual
设置颜色。使用一些随机示例data
尝试一下:
library(usmap)
library(ggplot2)
library(dplyr)
# example data
set.seed(42)
data <- utils::read.csv(system.file("extdata", "county_fips.csv",
package = "usmap")) %>%
select(fips) %>%
mutate(treatment = sample(c(0, 1), nrow(.), replace = TRUE))
# Convert treatment to factor
data <- mutate(data, treatment = factor(treatment))
plot_usmap(regions = "county", data=data, values = "treatment",color="grey")+
theme(panel.background = element_rect(colour = "black")) +
scale_fill_manual(values = c(`0` = "white", `1` = "blue"), name = "treatment") +
theme(legend.position = "right")
由reprex package(v0.3.0)在2020-04-20创建