r - 加权ggplot2警告: Ignoring unknown aesthetics: weight

Question

我尝试使用 ggplot2 绘制加权密度。结果似乎不错，但我收到以下警告:警告:忽略未知的美学:重量。类似的问题似乎出现在other ggplot2 applications中因此我想知道是否可以忽略该警告。

可重现的示例:

library(ggplot2)

set.seed(123)

# Some random data & weights
x <- rnorm(1000, 5)
w <- x^5

# Plot unweighted
ggplot() + stat_density(aes(x = x))

# Plot weighted - Warning: Ignoring unknown aesthetics: weight
ggplot() + stat_density(aes(x = x, weight = w / sum(w))) # Weighting seems to work fine

# Comparison of weighted density in base graphics - Same results as with ggplot2
plot(density(x, weights = w / sum(w)))

可以忽略此警告消息吗？

Answer 1

您可以使用geom_密度来避免警告:

ggplot() + 
  geom_density(aes(x = x, weight = w / sum(w)), color = "green") +
  geom_density(aes(x = x), color = "blue")

我本来期望 stat_ 函数能够处理与 geom 相同的美感，而且它似乎确实这样做了。该警告将是一个错误，应向维护人员报告。