Mirror density curve

A density plot is a representation of the distribution of a numeric variable. It is a smoothed version of the histogram and is used in the same kind of situation. Here is a basic example of a mirror density plot.

# Libraries
library(ggplot2)
library(hrbrthemes)

# Creation of dataset
data <- data.frame(
  var1 <- rnorm(1000),
  var2 <- rnorm(1000, mean=2)
)

# Mirror density curve
ggplot(data, aes(x=x)) + 
  # Top one
  geom_density(aes(x = var1, y = ..density..), fill = "#e41a1c") +
  geom_label(aes(x=4.5, y=0.25, label="Variable 1"), color = "#e41a1c") +
  # Bottom one
  geom_density(aes(x = var2, y = -..density..), fill = "#377eb8") +
  geom_label(aes(x=4.5, y=-0.25, label="Variable 2"), color = "#377eb8") +
  theme_ipsum()

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