用ggplot2中的geom_smooth绘制虚线回归线

问题描述

我在ggplot2中有一个简单的图，并且想添加一条虚线的回归线。到目前为止，我有：

pre $ library $ g $ b $ ggplot ））+
geom_point（）+
geom_smooth（method =lm，se = FALSE）+
theme_bw（）

返回我想要的内容，但带有一条实线：

），linetype是geom_smooth理解的美学之一。

因此，您可以调整为使用 geom_smooth（method =lm，se = FALSE，linetype =dashed）
$ p $ library（ggplot2）
ggplot（mtcars，aes（x = hp，y = mpg）） +
geom_point（）+
geom_smooth（method =lm，se = FALSE，linetype =dashed）+
theme_bw（）





I have a simple plot in ggplot2 and want to add a dashed regression line. So far I have:

library(ggplot2)
ggplot(mtcars, aes(x = hp, y = mpg)) +
  geom_point() +
  geom_smooth(method = "lm", se = FALSE) +
  theme_bw()

Which returns what I want, but with a solid line:

I want to make the line dashed. I think I should use scale_linetype_manual() but my attempts have been hacky.

A simple question, but I couldn't find a duplicate.

解决方案

As per the help page (see ?geom_smooth), linetype is one of the aesthetics geom_smooth understands.

So, you can adjust to use geom_smooth(method = "lm", se = FALSE, linetype="dashed")

library(ggplot2)
ggplot(mtcars, aes(x = hp, y = mpg)) +
  geom_point() +
  geom_smooth(method = "lm", se = FALSE, linetype = "dashed") +
  theme_bw()

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