geom_area图的平滑数据

Question

我有这样的数据：

df <- tibble(
    x = 1:20,
    y = c(4, 4, 2, 1, 8, 3, 4, 2, 8, 2, 2, 2, 2, 6, 1, 7, 8, 9, 9, 2)
)

图上，看上去如下：

df %>% 
    ggplot(aes(x, y)) + 
    geom_area()

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但这张图确实令人不快。我怎样才能把锯齿状的边缘平滑成这样的东西：

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谢谢!

Answer 1

扩展Axeman的注释:光滑可以由span参数控制。

示例1：

df %>% 
    ggplot(aes(x, y)) + 
    # original, delete if desired
    geom_area(alpha = 1/2) + 
    stat_smooth(
        geom = 'area', method = 'loess', span = 1/3,
        alpha = 1/2, fill = "red") + 
    labs(title = "Smooth with `span = 1/3`")

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示例2：

df %>% 
    ggplot(aes(x, y)) + 
    geom_area(alpha = 1/2) + 
    # original, delete if desired
    stat_smooth(
        geom = 'area', method = 'loess', span = 7/10,
        alpha = 1/2, fill = "blue") + 
    labs(title = "Smooth with `span = 7/10`")

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