如何使用 GGPlot 绘制两条回归虚线

Question

我目前正在尝试使用 ggplot 函数形成两条虚线。该图显示了属于两个不同因素组的两条回归线。我已经能够使其中一条线变成虚线，但我无法让另一条线变成虚线。任何帮助将不胜感激。

coli_means  %>% 
  ggplot(aes(time, mean_heartrate, group = treatment)) + 
  geom_point( aes(group = treatment, color = treatment)) + 
  geom_smooth(aes(method = "loess", linetype = treatment, se = FALSE, 
                  group = treatment, color = treatment, show.legend = TRUE))

我觉得我缺少一个简单的输入。谢谢

Answer 1

你需要做的是使用 scale_linetype_manual() 然后告诉它两个治疗组都需要一条虚线。

让我们从一个可重现的例子开始：

# reproducible example:
set.seed(0)
time <- rep(1:100,2)
treatment <- c(rep("A",100), rep("B",100))
mean_heartrate <- c(rnorm(100,60,2), rnorm(100,80,2))

coli_means <- data.frame(time, treatment, mean_heartrate)

# ggplot
coli_means  %>% 
  ggplot(aes(x = time, y = mean_heartrate)) + 
  geom_point(aes(color = treatment)) + 
  geom_smooth(aes(linetype = treatment, color = treatment))+
  scale_linetype_manual(values = c('dashed','dashed'))

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