我根据价格变量过滤了钻石数据框,以获得低于或等于10000的价格,并将新数据框命名为df。
然后,我添加了一个具有price列分位数的新列分位数。最高价格是第1个分位数(前20%),最低价格是第5个分位数。
Q1定义用于绘制不同分位数之间的垂直线的值。
library(ggplot2)
library(dplyr)
df <- diamonds %>% filter(price <= 10000)
df <- within(df, quantile <- 6 - as.integer(cut(price, quantile(price, probs=0:5/5), include.lowest=TRUE)))
df$quantile<-factor(df$quantile, levels=c("1", "2", "3", "4", "5","6", "7", "8", "9","10"))
Q1 <- quantile(df$price, 1:4/5)
ggplot(df, aes(x=price, y= carat, color=quantile))+
geom_point(alpha=0.4, size=1)+
geom_vline(xintercept=Q1, alpha=0.5, linetype="longdash")+
geom_text(aes(x=5000, y=2,
label="80th %ile"), hjust=1, vjust= 1, angle =90, colour="blue") +
geom_text(aes(x=2850, y=2,
label="60th %ile"),
hjust=1, vjust= 1, angle =90, colour="blue")+
geom_text(aes(x=820, y=2,
label="20th %ile"),
hjust=1, vjust= 1, angle =90, colour="blue")+
facet_wrap(~cut, ncol=2, scales="free_y")+
theme_bw()+
labs(x="Price ($)", y="Carat")
由于facet_wrap中的刻度,垂直线的标签未对齐在一起。此外,标签与点重叠,如下所示
我通过删除facet_wrap中的scales =“free_y”并在geom_text中将y更改为3来解决此问题
在之前的图中,它工作正常,因为在钻石切割水平之间y值的变化不大。
但是,如果我的数据框具有完全不同的y值,那么我无法在geom_text中修复y值。
当facet_wrap中的y值不同而没有删除scale =“free_y”时,有没有办法对齐垂直线的标签?
答案 0 :(得分:2)
这是怎么回事?
library(ggplot2)
library(dplyr)
df <- diamonds %>% filter(price <= 10000)
df <- within(df, quantile <- 6 - as.integer(cut(price, quantile(price, probs=0:5/5), include.lowest=TRUE)))
df$quantile<-factor(df$quantile, levels=c("1", "2", "3", "4", "5","6", "7", "8", "9","10"))
Q1 <- quantile(df$price, 1:4/5)
lbl <- data.frame(cut = c("Ideal", "Premium", "Very Good", "Good", "Fair"),
y_offset = c(max(df$carat[df$cut == "Ideal"]) * 0.6,
max(df$carat[df$cut == "Premium"]) * 0.6,
max(df$carat[df$cut == "Very Good"]) * 0.6,
max(df$carat[df$cut == "Good"]) * 0.6,
max(df$carat[df$cut == "Fair"]) * 0.6))
ggplot()+
geom_point(data = df, aes(x=price, y= carat, color=quantile), alpha=0.4, size=1)+
geom_vline(data = df, xintercept=Q1, alpha=0.5, linetype="longdash")+
geom_text(data = lbl, aes(x=5000, y=y_offset,
label="80th %ile"), hjust=1, vjust= 1, angle =90, colour="blue") +
geom_text(data = lbl, aes(x=2850, y=y_offset,
label="60th %ile"),
hjust=1, vjust= 1, angle =90, colour="blue")+
geom_text(data = lbl, aes(x=820, y=y_offset,
label="20th %ile"),
hjust=1, vjust= 1, angle =90, colour="blue")+
facet_wrap(~cut, ncol=2, scales="free_y")+
theme_bw()+
labs(x="Price ($)", y="Carat")