将stat_smooth()
与geom_point
一起使用时,是否有办法删除阴影拟合区域,但只绘制其外边界?我知道我可以删除阴影区域,例如:
geom_point(aes(x=x, y=y)) + geom_stat(aes(x=x, y=y), alpha=0)
但我怎样才能使它的外边界(外部曲线)仍然可见为微弱的黑线?
答案 0 :(得分:11)
您还可以geom_ribbon
= NA使用fill
。
gg <- ggplot(mtcars, aes(qsec, wt))+
geom_point() +
stat_smooth( alpha=0,method='loess')
rib_data <- ggplot_build(gg)$data[[2]]
ggplot(mtcars)+
stat_smooth(aes(qsec, wt), alpha=0,method='loess')+
geom_point(aes(qsec, wt)) +
geom_ribbon(data=rib_data,aes(x=x,ymin=ymin,ymax=ymax,col='blue'),
fill=NA,linetype=1)
...如果由于某种原因你不想要垂直条,你可以只使用两个geom_line
层:
ggplot(mtcars)+
stat_smooth(aes(qsec, wt), alpha=0,method='loess')+
geom_point(aes(qsec, wt)) +
geom_line(data = rib_data,aes(x = x,y = ymax)) +
geom_line(data = rib_data,aes(x = x,y = ymin))
答案 1 :(得分:9)
最有可能采用更简单的方式,但您可以尝试将此作为开始。我使用ggbuild
获取置信区间的数据,然后我在geom_line
# create a ggplot object with a linear smoother and a CI
library(ggplot2)
gg <- ggplot(data = mtcars, aes(x = wt, y = mpg)) +
geom_point() +
geom_smooth(method = "lm")
gg
# grab the data from the plot object
gg_data <- ggplot_build(gg)
str(gg_data)
head(gg_data$data[[2]])
gg2 <- gg_data$data[[2]]
# plot with 'CI-lines' and the shaded confidence area
ggplot(data = mtcars, aes(x = wt, y = mpg)) +
geom_point() +
geom_smooth(method = "lm", se = TRUE, size = 1) +
geom_line(data = gg2, aes(x = x, y = ymin), size = 0.02) +
geom_line(data = gg2, aes(x = x, y = ymax), size = 0.02)
# plot with 'CI-lines' but without confidence area
ggplot(data = mtcars, aes(x = wt, y = mpg)) +
geom_point() +
geom_smooth(method = "lm", se = FALSE, size = 1) +
geom_line(data = gg2, aes(x = x, y = ymin), size = 0.02) +
geom_line(data = gg2, aes(x = x, y = ymax), size = 0.02)