我有两个非常相似的图,它们有两个y轴-条形图和线形图:
代码:
sec_plot <- ggplot(data, aes_string (x = year, group = 1)) +
geom_col(aes_string(y = frequency), fill = "orange", alpha = 0.5) +
geom_line(aes(y = severity))
但是,没有标签。我想为条形图以及线图获得标签,例如:
如果只有一个人组,如何将标签添加到绘图中?有没有办法手动指定?直到我才知道只有在aes
这里是一个可能的解决方案。我使用的方法是移动颜色并填充到aes内部,然后使用scale _ * _ identity创建和设置图例格式。另外,由于ggplot不能很好地处理辅助轴,因此我需要为严重度轴添加比例因子。
data<-data.frame(year= 2000:2005, frequency=1*(3:8), severity=as.integer(runif(6, 4000, 8000)))
library(ggplot2)
library(scales)
sec_plot <- ggplot(data, aes(x = year)) +
geom_col(aes(y = frequency, fill = "orange"), alpha = 0.6) +
geom_line(aes(y = severity/1000, color = "black", group=1)) +
scale_fill_identity(guide = "legend", label="Claim frequency (Number of paid claims per 100 Insured exposure)", name=NULL) +
scale_color_identity(guide = "legend", label="Claim Severity (Average insurance payment per claim)", name=NULL) +
theme(legend.position = "bottom") +
scale_y_continuous(sec.axis =sec_axis( ~ . *1, labels = label_dollar(scale=1000), name="Severity") ) + #formats the 2nd axis
guides(fill = guide_legend(order = 1), color = guide_legend(order = 2)) #control which scale plots first
sec_plot