我怎样才能使这些样条线的颜色变暗?

How can I darken the colour of these splines?

随着数据点数量的增加,样条线在背投下变得不可见。 我怎样才能使样条线的颜色变暗? 或者其他方法来解决这个可见性问题?

  library(dplyr)
    library(ggplot2)
    library(mgcv)
    
    # Summer
    Summer <- mgcv::gamSim(eg=5,n=10000,dist="normal",scale=0.6,verbose=TRUE) %>%
      mutate(x = x2 * 20) %>%
      rename("Season" = x0) %>%
      mutate(Season = ifelse(Season == "1", "Summer", Season)) %>%
      filter(.,Season == "Summer") %>%
      select(y, x, Season)
    
    # Winter
    Winter <- mgcv::gamSim(eg=5,n=10000,dist="normal",scale=1.0,verbose=TRUE) %>%
      mutate(x = x1 * 20) %>%
      rename("Season" = x0) %>%
      mutate(Season = ifelse(Season == "3", "Winter", Season)) %>%
      filter(.,Season == "Winter") %>%
      select(y, x, Season)
    
    # Bind
    DF <- rbind(Summer, Winter)
    
    
    # Plot
    Plot <- DF %>%
      ggplot(., aes(x = x, y = y, colour = Season)) +
      geom_jitter() +
      geom_point(shape=21, alpha = 0.5,  size=0.05) +
      geom_smooth(method = "gam", formula = y ~ s(x, bs = "cs", k = 10),  lwd = 1.6)
    Plot
  1. 您的 geom_jitter() 正在创建全尺寸和完全不透明的点;相反,将 position = "jitter" 添加到 geom_point() (我假设你真的不想要 both 抖动点和原始位置的点?)
  2. 我在你的 geom_point() 中调整了 alphasize,但你可能想要更多地使用它们(即,随着样本量的增加,减小大小和不透明度) .如果您的数据集变得非常大,您可以尝试使用 geom_hexbin()
  3. 我发现通过 theme_bw()(甚至 theme_classic())将背景更改为白色可以更轻松地查看背景中的值。

你不能使拟合线更暗(除非你想切换到 scale_color_manual(values = c("red", "blue")) 之类的东西),但如果你想更清楚地看到置信度带,你可以增加 alpha and/or 为它们设置 fill 颜色。

Plot <- DF %>%
  ggplot(., aes(x = x, y = y, colour = Season)) +
  geom_point(shape=21, alpha = 0.7,  size=0.5, position = "jitter") +
  geom_smooth(method = "gam", formula = y ~ s(x, bs = "cs", k = 10),  lwd = 1.6) + 
  theme_bw()

如果您希望线条突出于点,那么我会将 alpha 调整为 geom_jitter。部分问题是您在抖动上绘制点。我不认为你需要这两个(除非我遗漏了什么)。

library(ggplot2)

Plot <- DF %>%
      ggplot(., aes(x = x, y = y, colour = Season)) +
      geom_jitter(alpha = 0.2) +
      geom_smooth(method = "gam", formula = y ~ s(x, bs = "cs", k = 10),  lwd = 1.6)

Plot